13 (number)

Short description: Natural number

| <- 12  | 13 |  14 ->

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← 10 11 12 13 14 15 16 17 18 19 →

List of numbers — Integers

← 0 10 20 30 40 50 60 70 80 90 →

Cardinal| thirteen
Ordinal| 13th
(thirteenth)
Numeral system| tredecimal
Factorization| prime
Prime| 6th
Divisors| 1, 13
Greek numeral| ΙΓ´
Roman numeral| XIII
Binary| 11012
Ternary| 1113
Quaternary| 314
Quinary| 235
Senary| 216
Octal| 158
Duodecimal| 1112
Hexadecimal| D16
Vigesimal| D20
Base 36| D36

13 (thirteen) is the natural number following 12 and preceding 14.

Strikingly folkloric aspects of the number 13 have been noted in various cultures around the world: one theory is that this is due to the cultures employing lunar-solar calendars (there are approximately 12.41 lunations per solar year, and hence 12 "true months" plus a smaller, and often portentous, thirteenth month). This can be witnessed, for example, in the "Twelve Days of Christmas" of Western European tradition.[1]

## Contents

* 1 In mathematics
* 1.1 List of basic calculations
* 2 In science
* 3 In languages
* 3.1 Grammar
* 3.1.1 Folklore
* 3.2 In English
* 4 In religion
* 4.1 Islam
* 4.2 Catholicism
* 4.3 Sikhism
* 4.4 Judaism
* 4.5 Zoroastrianism
* 4.6 Confucianism
* 4.7 Aztec mythology
* 4.8 Wicca
* 5 Luck
* 5.1 Bad
* 5.2 Good
* 5.3 Other
* 6 Age 13
* 7 History
* 8 In sports
* 9 In TV, films and literature
* 10 See also
* 11 References

## In mathematics

The number 13 is the sixth prime number. It is a twin prime with 11, as well as a cousin prime with 17. It is the second Wilson prime, of three known (the others being 5 and 563),[2] and the smallest emirp in decimal.[3]

13 is:

* The second star number:[4]

16px|*16px|*16px|*16px|*
16px|*16px|*16px|*
16px|*16px|*16px|*16px|*
16px|*

* The third centered square number:

16px|*16px|*16px|*
16px|*16px|*16px16px|*16px|*
16px|*16px|*16px|*
16px|*

* A happy number[5] and a lucky number.[6]
* A Fibonacci number, preceded by 5 and 8.
* The smallest number whose fourth power can be written as a sum of two consecutive square numbers (1192 \+ 1202).
* The sum and the difference of 2 consecutive squares: 13 = (22 \+ 32) = (72 \- 62).

Also,

* There are 13 ways for the three fastest horses in a horse race to finish, allowing for ties, a fact that can be expressed mathematically by 13 being the third ordered Bell number.[7]
* Since 52 \+ 122 = 132, (5, 12, 13) forms a Pythagorean triple, and as such represent the sides of a right triangle.
* A 13-sided regular polygon is called a tridecagon.
* There are 13 hexagonal isohedral tilings.
* There are 13 distinct cubic distance-regular graphs, of which the Platonic Tetrahedral graph and dodecahedral graph are part.
* There are 13 Archimedean solids without counting enantiomorphic forms. Some also include the elongated square gyrobicupola as another Archimedean solid.
* There are 13 architectonic honeycombs: 8 originate from the C~3 cubic group and 5 originate from the B~3 alternated cubic group and A~3 cyclic group. The 13 dual honeycombs to these are the 13 catoptric honeycombs, which are made of 13 types of stereohedra.[8]
* A standard torus can be sliced into 13 pieces with just 3 plane cuts.[3]
* There are 13 particular Coxeter groups that generate uniform prismatic tessellations in Euclidean 4-space.[9]
* There are 13 collections of subsets of {1, 2} that are closed under union and intersection.[10]
* It is the smallest non-trivial hyperfactorion i.e., it is equal to sum of hyperfactorials of its digits.

H(1) + H(3) = (1!) + (1! * 2! * 3!) = 1 + (1 * 2 * 6) = 1 + 12 = 13

### List of basic calculations

Multiplication | 1  | 2  | 3  | 4  | 5  | 6  | 7  | 8  | 9  | 10  |  | 11  | 12  | 13  | 14  | 15  | 16  | 17  | 18  | 19  | 20  |  | 21  | 22  | 23  | 24  | 25  |  | 50  | 100  | 1000

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(13)x | 13 | 26 | 39 | 52 | 65 | 78 | 91 | 104 | 117 | 130 |  | 143 | 156 | 169 | 182 | 195 | 208 | 221 | 234 | 247 | 260 |  | 273 | 286 | 299 | 312 | 325  |  | 650  | 1300  | 13000
Division | 1  | 2  | 3  | 4  | 5  | 6  | 7  | 8  | 9  | 10  |  | 11  | 12  | 13  | 14  | 15  | 16

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13 ÷ x | 13 | 6.5  | 4.3 | 3.25  | 2.6  | 2.16 | 1.857142 | 1.625  | 1.4 | 1.3  |  | 1.18 | 1.083 | 1  | 0.9285714 | 0.86 | 0.8125
x ÷ 13 | 0.076923 | 0.153846 | 0.230769 | 0.307692 | 0.384615 | 0.461538 | 0.538461 | 0.615384 | 0.692307 | 0.769230 |  | 0.846153 | 0.923076 | 1  | 1.076923 | 1.153846 | 1.230769
Exponentiation | 1  | 2  | 3  | 4  | 5  | 6  | 7  | 8  | 9  | 10  |  | 11  | 12

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13x | 13 | 169  | 2197  | 28561  | 371293  | 4826809  | 62748517  | 815730721  | 10604499373  | 137858491849  |  | 1792160394037  | 23298085122481
x13 | 1  | 8192  | 1594323  | 67108864  | 1220703125  | 13060694016  | 96889010407  | 549755813888  | 2541865828329  | 10000000000000  |  | 34522712143931  | 106993205379072

## In science

* The atomic number of aluminium is 13.

## In languages

### Grammar

* In all Germanic languages, 13 is the first compound number; the numbers 11 and 12 have their own names.
* The Romance languages use different systems: In Italian, 11 is the first compound number (undici), as in Romanian (unsprezece), while in Spanish and Portuguese, the numbers up to and including 15 (Spanish quince, Portuguese quinze), and in French and Italian up to and including 16 (French seize, Italian sedici) have their own names. This is also the case in most Slavic languages, Hindi-Urdu and other South Asian languages.[example needed]

#### Folklore

In Germany, according to an old tradition, 13 (dreizehn), as the first compound number, was the first number written in digits; the numbers 0 (null) through 12 (zwölf) were spelled out. The Duden (the German standard dictionary) now calls this tradition (which was actually never written down as an official rule) outdated and no longer valid, but many writers still follow it.[11]

### In English

Thirteen is one of two numbers within the teen numerical range (13–19), along with fifteen, not derived by cardinal numeral (three) and the teen suffix; instead, it is derived from the ordinal numeral (third).

## In religion

### Islam

In Shia, 13 signifies the 13th day of the month of Rajab (the Lunar calendar), which is the birth of Imam Ali. 13 also is a total of 1 Prophet and 12 Shia Imams in the Islamic School of Thought.

Christianity

In all branches of Christianity it´s said that Christ had 12 disciples, thus forming a group of 13. It´s best known by the representations of the last supper.

### Catholicism

The apparitions of the Virgin of Fátima in 1917 were claimed to occur on the 13th day of six consecutive months.[12]

In Catholic devotional practice, the number thirteen is also associated with Saint Anthony of Padua, since his feast day falls on June 13. A traditional devotion called the Thirteen Tuesdays of St. Anthony[13] involves praying to the saint every Tuesday over a period of thirteen weeks. Another devotion, St. Anthony's Chaplet, consists of thirteen decades of three beads each.[14]

### Sikhism

According to famous Sakhi (evidence) or the story of Guru Nanak Dev Ji, when he was an accountant at a town of Sultanpur Lodhi, he was distributing groceries to people. When he gave groceries to the 13th person, he stopped because in Gurmukhi and Hindi the word 13 is called terah, which means yours. And Guru Nanak Dev Ji kept saying, "Yours, yours, yours..." remembering God. People reported to the emperor that Guru Nanak Dev Ji was giving out free food to the people. When treasures were checked, there was more money than before.

### Judaism

* In Judaism, 13 signifies the age at which a boy matures and becomes a Bar Mitzvah, i.e., a full member of the Jewish faith (counts as a member of Minyan).
* The number of principles of Jewish faith according to Maimonides.
* According to Rabbinic commentary on the Torah, God has 13 Attributes of Mercy.

### Zoroastrianism

Since beginning of the Nowruz tradition, the 13th day of each new Iranian year is called Sizdah Be-dar, a festival dedicated to pranks and spending time outdoors.[15]

### Confucianism

* The Thirteen Classics is considered to be a part of the Chinese classics.

### Aztec mythology

According to Aztec mythology, the Thirteen Heavens were formed by the gods from the head of Cipactli during creation.[16]

### Wicca

A common tradition in the religion Wicca holds that the number of members for a coven is ideally thirteen, though this tradition is not universal.[17]

## Luck

### Bad

Further information: Unsolved:Triskaidekaphobia

This elevator skips the number 13 and jumps from floor 12 to 14. The thirteenth floor continues to physically exist, but is now represented by the numerical symbols for the number 14.

The number 13 is considered an unlucky number in some countries.[18] The end of the Mayan calendar's 13th Baktun was superstitiously feared as a harbinger of the apocalyptic 2012 phenomenon.[19] Fear of the number 13 has a specifically recognized phobia, triskaidekaphobia, a word first recorded in 1911.[20] The superstitious sufferers of triskaidekaphobia try to avoid bad luck by keeping away from anything numbered or labelled thirteen. As a result, companies and manufacturers use another way of numbering or labelling to avoid the number, with hotels and tall buildings being conspicuous examples (thirteenth floor).[21] It is also considered unlucky to have thirteen guests at a table. Friday the 13th has been considered an unlucky day.[18]

There are a number of theories as to why the number thirteen became associated with bad luck, but none of them have been accepted as likely.[18]

The Last Supper
At Jesus Christ's Last Supper, there were thirteen people around the table, counting Christ and the twelve apostles. Some believe this is unlucky because one of those thirteen, Judas Iscariot, was the betrayer of Jesus Christ. From the 1890s, a number of English language sources relate the "unlucky" thirteen to an idea that at the Last Supper, Judas, the disciple who betrayed Jesus, was the 13th to sit at the table.[22]
Knights Templar
On Friday, 13 October 1307, King Philip IV of France ordered the arrest of the Knights Templar,[18] and most of the knights were tortured and killed.
Full moons
A year with 13 full moons instead of 12 posed problems for the monks in charge of the calendars. "This was considered a very unfortunate circumstance, especially by the monks who had charge of the calendar of thirteen months for that year, and it upset the regular arrangement of church festivals. For this reason, thirteen came to be considered an unlucky number."[23] However, a typical century has about 37 years that have 13 full moons, compared to 63 years with 12 full moons, and typically every third or fourth year has 13 full moons.[24]
A suppressed lunar cult
In ancient cultures, the number 13 represented femininity, because it corresponded to the number of lunar (menstrual) cycles in a year (13 × 28 = 364 days). The theory is that, as the solar calendar triumphed over the lunar, the number thirteen became anathema.[18][25]
Hammurabi's code
There is a myth that the earliest reference to thirteen being unlucky or evil is in the Babylonian Code of Hammurabi (circa 1780 BC), where the thirteenth law is said to be omitted. In fact, the original Code of Hammurabi has no numeration. The translation by L.W. King (1910), edited by Richard Hooker, omitted one article: If the seller have gone to (his) fate (i. e., have died), the purchaser shall recover damages in said case fivefold from the estate of the seller. Other translations of the Code of Hammurabi, for example the translation by Robert Francis Harper, include the 13th article.[26]

### Good

Singer Taylor Swift considers the number 13 to be lucky & references throughout her work[27]

* France: 13 was traditionally considered a lucky number in France prior to the First World War, and was used in numerical form as a good luck symbol on postcards and charms.[28]
* Italy: 13 was the lucky number in the Italian football pools (Totocalcio). The Italian expression "fare tredici" (literally, "make thirteen") means to hit the jackpot.[29]
* United States: Colgate University also considers 13 a lucky number. They were founded in 1819 by 13 men with 13 dollars, 13 prayers and 13 articles.[30] (To this day, members of the Colgate community consider the number 13 a good omen.) In fact, the campus address is 13 Oak Drive in Hamilton, New York, and the male a cappella group is called the Colgate 13.

### Other

In the Mayan Tzolk'in calendar, trecenas mark cycles of 13-day periods. The pyramids are also set up in 9 steps divided into 7 days and 6 nights, 13 days total.

In the standard 52-card deck of playing cards there are four suits, each of 13 ranks.

A baker's dozen, devil's dozen,[31] long dozen, or long measure is 13, one more than a standard dozen. The thirteenth loaf is called the vantage loaf because it is considered advantageous overall to get 13 loaves for the price of 12.[32]

In Arthurian legend, which was recorded in Medieval texts, King Arthur is resting in Avalon with the twelve greatest knights of the Round Table, totalling 13, and will return when his country is in peril.[33]

The Thirteen Treasures of Britain are a series of magical items listed in late Medieval texts.

The Thirteen Postures of Tai Chi are thirteen postures (consisting of Eight Gates and Five Steps) which are considered to be of fundamental importance in the practice of tai chi.[34]

In astronomy there are 13 star constellations in the zodiac (including Ophiuchus); this can be compared with astrology where there are 12 signs of the zodiac.

In Judaism, 13 signifies the age at which a boy matures and becomes a Bar Mitzvah, i.e., a full member of the Jewish faith (counts as a member of Minyan). The number of principles of Jewish faith according to Maimonides. According to Rabbinic commentary on the Torah, God has 13 Attributes of Mercy.

In a tarot card deck, XIII is the card of Death, usually picturing the Pale Horse with its rider.

## Age 13

* In Judaism, thirteen signifies the age at which a boy matures and becomes a Bar Mitzvah, i.e., a full member of the Jewish faith (is qualified to be counted as a member of Minyan).[clarification needed]
* Thirteen is the minimum age of consent in Argentina , Burkina Faso, Japan , Niger, and two Mexican states.
* On many social media platforms in the United States , 13 is the standard minimum age to be allowed to create an account in compliance with the Children's Online Privacy Protection Act (COPPA).
* This is the age at which the Entertainment Software Rating Board (ESRB) assesses for T-rated games and the Motion Picture Association recommends movies with a PG-13 rating.

## History

The Great Seal of the United States features several groupings which consist of 13 things of the same type e.g. 13 olive leaves, 13 stars, 13 arrows.

* The United States of America was created from thirteen British colonies and as such, the number thirteen is a commonly recurring motif in American heraldry. For example, there are thirteen stars on the Great Seal of the United States and there are thirteen stripes on the American flag as well as thirteen rays on the Flag of Arizona.
* The first flag of the United States bore thirteen stripes, alternating red and white, and thirteen white stars in the blue union. The thirteen stripes represented the Thirteen Colonies from which the United States was created, and the thirteen stars represented the number of states in the new nation. When two new states were added to the Union in 1795, the flag bore fifteen stars and fifteen stripes. With the addition of five new states in 1818, the number of stripes was re-set and permanently fixed at thirteen.
* The Great Seal of the United States bears many images of the number thirteen, representing the Thirteen Colonies from which the United States was created. On the Seal's obverse, the overhead glory bears thirteen stars. The chest shield in front of the spread eagle bears thirteen stripes (seven white and six red). The eagle's right talon holds the Olive Branch of Peace, bearing thirteen olives and thirteen olive leaves. The eagle's left talon holds the Weapons of War, consisting of thirteen arrows. The eagle's mouth holds a scroll bearing the national motto "E Pluribus Unum" (which, by coincidence, consists of thirteen letters). On the Seal's reverse, the unfinished pyramid consists of thirteen levels.
* The Thirteenth Amendment to the United States Constitution abolished slavery and involuntary servitude (except as a punishment for crime).
* Apollo 13 was a NASA Moon mission famous for being a "successful failure" in 1970.

## In sports

* The number 13 was not used in the Indianapolis 500 from 1915 to 2002. It was not permitted for use between 1926 and 2002. In 2009, E. J. Viso, driving for HVM Racing in the 2009 IndyCar Series season, drove a green number 13 car full-time, despite terrible superstitions about it in motorsports.
* The number 13 was not used in Formula One from 1977 to 2013.
* In rugby league:
* Each side has 13 players on the field at any given time.
* The jersey number 13 is worn by the starting loose forward or lock forward in most competitions. An exception is in the Super League, which uses static squad numbering.
* In rugby union, the jersey number 13 is worn by the outside centre.
* In triathlon, the number 13 is not used. As such, the numbering goes 11, 12, 14, 15 under the current numbering system.
* In Petanque, standard games are won when a team reaches the score of 13 points. A 13–0 score is called Fanny.
* Effective with the 2020 season, Major League Baseball teams are allowed no more than 13 pitchers on their active rosters at any time during the season. The main exception is from September 1 to the end of the regular season, when this number increases to 14.
* In NCAA Division I men's college basketball, teams are allowed to provide scholarships to no more than 13 players at any given time.
* In pool:
* The pool ball 13 is the 13th in pool and its color is orange (pink in the Brazilian pool).

## In TV, films and literature

* 13th, a 2016 documentary.[35]
* 13 (musical), a 2007 musical.
* 13 (film), an English-language remake of the 2005 French film 13 Tzameti.
* Thirteen (film), a 2003 American film.[36]
* Thirteen (TV series), a 2016 British five-part police drama.
* Number 13 (film), an uncompleted Hitchcock 1922 film.
* 13 Tzameti, a 2005 French film ("Tzameti" means "13" in Georgian).[37]
* 13 Ghosts is a 1960 horror film.[38]
* Thirteen Ghosts is a 2001 remake.[39]
* Thirteen is the nickname of Dr. Remy Hadley on the American medical drama House played by Olivia Wilde.
* 13 Assassins is a 2010 film by Japanese director Takashi Miike.[40]
* The Thirteen is a 1936 Soviet war film by Mikhail Romm.[41]
* The 13th Warrior is a 1999 historical fiction action film starring Antonio Banderas.[42]
* District 13 is a 2004 French film (with David Belle).
* Apollo 13 is a 1995 American film.[43]
* Warehouse 13 is a television show about the 13th warehouse in the line of warehouses that store supernatural artifacts.
* Friday the 13th is a horror film series involving a mass murderer named Jason Voorhees.[44]
* Friday the 13th: The Series is a syndicated American-Canadian horror television series, that originally ran from 1987 to 1990.
* The 13 Ghosts of Scooby-Doo: Seventh incarnation of the Hanna-Barbera Scooby-Doo cartoon franchise, first run 1985–1986.
* The Thirteenth Floor is a 1999 sci-fi film.
* Golgo 13, centered around a self-titled assassin, is the oldest manga still in publication. It is the second or third best selling manga in history.[45]
* 13B/Yaavarum Nalam is a 2009 Hindi/Tamil Horror movie starring R Madhavan.[46]
* Thirteen Reasons Why is a novel containing 13 tapes received by a student learning of his classmate's suicide.
* The Thirteenth Doctor, the 13th incarnation of the titular character of Doctor Who, played by Jodie Whittaker.
* In The Hobbit, the Company of Thorin Oakenshield consists of 13 Dwarves trying to reclaim their homeland from the dragon Smaug (Thorin Oakenshield, Fíli, Kíli, Óin, Glóin, Balin, Dwalin, Bifur, Bofur, Bombur, Dori, Nori and Ori).
* In The Wheel of Time series, the 13 Forsaken are sorcerers imprisioned for 3,000 years before escaping: Aginor, Asmodean, Balthamel, Be'lal, Demandred, Graendal, Ishamael, Lanfear, Mesaana, Moghedien, Rahvin, Sammael and Semirhage.
* 13 Going on 30 is a 2004 romantic comedy film.

## See also

* List of highways numbered 13

## References

1. ↑ Frazier, King of the Bean, and the Festival of Fools. Cited in Thompson, Tok. 2002. The thirteenth number: Then, there/ here and now. Studia Mythological Slavica 5, 145–159.
2. ↑ "Sloane's A001844 : Centered square numbers". OEIS Foundation. https://oeis.org/A001844.
3. ↑ 3.0 3.1 Wells, D. The Penguin Dictionary of Curious and Interesting Numbers, London: Penguin Group. (1987): 67–71.
4. ↑ "Star Number". https://mathworld.wolfram.com/StarNumber.html.
5. ↑ "Sloane's A007770 : Happy numbers". OEIS Foundation. https://oeis.org/A007770.
6. ↑ "A000959 Lucky numbers. (Formerly M2616 N1035)". OEIS Foundation. https://oeis.org/A000959.
7. ↑ de Koninck, J. M. (2009), Those Fascinating Numbers, American Mathematical Society, p. 4, ISBN 9780821886311, https://books.google.com/books?id=qYuC1WsDKq8C&pg=PA4
8. ↑ Viana, Vena (2018). "From Solid to Plane Tessellations, and Back". Nexus Network 20 (3): 745–754. doi:10.1007/s00004-018-0389-5.
9. ↑ Regular and Semiregular polytopes, II, pp.298-302 Four-dimensional honeycombs
10. ↑ Sloane, N. J. A., ed. "Sequence A306445 (Number of collections of subsets of {1, 2, ..., n} that are closed under union and intersection)". OEIS Foundation. https://oeis.org/A306445. Retrieved 2022-05-22.
11. ↑ "Duden | Schreibung von Zahlen bis 12" (in de). https://www.duden.de/sprachwissen/sprachratgeber/Schreibung-von-Zahlen-0.
12. ↑ Rosemary Guiley, The Guinness Encyclopedia of Ghosts and Spirits, 1994, p. 215, ISBN 0-85112-748-7.
13. ↑ "The Shrine of St. Anthony". http://www.shrineofstanthony.org/novena-to-st-anthony.htm.
14. ↑ "Liturgical Year: Prayers: Chaplet of St. Anthony". http://www.catholicculture.org/culture/liturgicalyear/prayers/view.cfm?id=1236.
15. ↑ Allen, Emily; Eysenck, Juliet (April 1, 2016). "April Fool's Day: What are the best spoofs and how did it originate?". The Daily Telegraph. https://www.telegraph.co.uk/technology/2016/03/22/april-fools-day-2016-how-did-the-tradition-originate-and-what-ar/.
16. ↑ Adela Fernández (1 January 1992) (in Spanish). Dioses prehispánicos de México: mitos y deidades del panteón náhuatl. Panorama Editorial. pp. 30, 33, 34. ISBN 9789683803061. https://books.google.com/books?id=FG45qSQgDwwC. Retrieved 2022-02-13.
17. ↑ Raymond Buckland (1986). Buckland's Complete Book of Witchcraft. St. Paul, MN: Llewellyn. pp. 17–18–53. ISBN 9780875420509. https://books.google.com/books?id=fr0pse0LBK0C. Retrieved 2022-02-17.
18. ↑ 18.0 18.1 18.2 18.3 18.4 Emery, David. "Why Is Friday the 13th Unlucky? - History and Folklore". About.com Entertainment. http://urbanlegends.about.com/cs/historical/a/friday_the_13th.htm.
19. ↑ "Most Popular E-mail Newsletter". USA Today. November 24, 2011. https://www.usatoday.com/tech/science/discoveries/story/2011-11-24/mexico-apocalypse-2012-mayans/51387348/1.
20. ↑ triskaidekaphobia (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=triskaidekaphobia (Subscription or UK public library membership required.)
21. ↑ Fleischman, Sid (August 19, 2007). "The 13th Floor: A Ghost Story". The Washington Post. https://www.washingtonpost.com/wp-dyn/content/article/2007/08/18/AR2007081800890.html.
22. ↑ Cecil Adams (1992-11-06). "Why is the number 13 considered unlucky?". The Straight Dope. Retrieved 2011-05-13.
23. ↑ "The Really Strange Story Behind Sunday's Blue Moon". Space.com. November 19, 2010. http://www.space.com/9566-strange-story-sunday-blue-moon.html.
24. ↑ Cooley, Keith (2008). "Full Moons 1900-2100". Johns Hopkins University Applied Physics Laboratory. http://home.hiwaay.net/~krcool/Astro/moon/fullmoonU.htm.
25. ↑ Stan Gooch, Guardians of the Ancient Wisdom (1980)
26. ↑ The Code of Hammurabi (Harper translation)
27. ↑ What Makes Taylor Swift's Lucky Number 13 So Special? See Here;Outlook India; Dec 14, 2023
28. ↑ Owen, Davies (2018). A Supernatural War: Magic, Divination, and Faith During the First World War. Oxford: Oxford University Press. p. 136. ISBN 9780198794554.
29. ↑ "Tredici: Definizione e significato di tredici" (in it). https://dizionari.corriere.it/dizionario_italiano/T/tredici.shtml.
30. ↑ "Colgate: History & Traditions". Colgate University. http://www.colgate.edu/DesktopDefault1.aspx?tabid=497&pgID=1200.
31. ↑ "Definition of DEVIL'S DOZEN" (in en). https://www.merriam-webster.com/dictionary/devil's+dozen.
32. ↑ "Vantage loaf". Green's Dictionary of Slang. Oxford University Press. 2011. ISBN 978-0-19-982994-1. https://www.oxfordreference.com/view/10.1093/acref/9780199829941.001.0001/acref-9780199829941-e-49852. Retrieved 22 July 2020.
33. ↑ Matthews, John (1991). A Glastonbury Reader. London: The Aquarian Press. p. 15. ISBN 1-85538-276-8.
34. ↑ "The 13 Postures and 13 Principles in Tai Chi Chuan". https://www.taichiandqigong.com/articles/the-13-postures-and-13-principles-in-tai-chi-chuan/.
35. ↑ (in en-us) 13th (2016) - Ava DuVernay | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/13th-v668193, retrieved 2020-08-10
36. ↑ (in en-us) Thirteen (2003) - Catherine Hardwicke | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/thirteen-v278975, retrieved 2020-08-10
37. ↑ (in en-us) 13 Tzameti (2005) - Géla Babluani | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/13-tzameti-v340443, retrieved 2020-08-10
38. ↑ (in en-us) 13 Ghosts (1960) - William Castle | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/13-ghosts-v67116, retrieved 2020-08-10
39. ↑ (in en-us) Thirteen Ghosts (2001) - Steve Beck | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/thirteen-ghosts-v254895, retrieved 2020-08-10
40. ↑ (in en-us) 13 Assassins (2010) - Takashi Miike | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/13-assassins-v525028, retrieved 2020-08-10
41. ↑ (in en-us) Trinadtsat (1936) - Mikhail Romm | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/trinadtsat-v113339, retrieved 2020-08-10
42. ↑ (in en-us) The 13th Warrior (1999) - John McTiernan | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/the-13th-warrior-v180407, retrieved 2020-08-10
43. ↑ (in en-us) Apollo 13 (1995) - Ron Howard | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/apollo-13-v134963, retrieved 2020-08-10
44. ↑ (in en-us) Friday the 13th (2009) - Marcus Nispel | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/friday-the-13th-v420112, retrieved 2020-08-10
45. ↑ "The Official Website for Golgo 13". Viz Media. Retrieved October 28, 2017.
46. ↑ (in en-us) 13B (2009) - Vikram Kumar, Vikram Chatwal | Synopsis, Characteristics, Moods, Themes and Related | AllMovie, https://www.allmovie.com/movie/13b-v466102, retrieved 2020-08-10

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Superstition

Main topics|

* Amulet
* Evil eye
* Luck
* Omen
* Talismans
* Myth and ritual

Lists|

* List of lucky symbols
* List of bad luck signs
* Sailors' superstitions
* Theatrical superstitions

Africa|

* Buda
* Gris-gris
* Sampy
* Sleeping child

Americas|

* Ascalapha odorata
* Carranca
* Cooties
* Curupira
* Djucu
* Fortune cookie
* Groundhog Day
* I'noGo tied
* Oscar love curse
* Susto
* White lighter myth
* Witch window

Asia|

* Superstition in India
* Superstition in Pakistan
* Japanese superstitions
* Bhoot (ghost)
* Chhaupadi
* Churel
* Ghosts in Bengali culture
* Jackal's horn
* Muhurta
* Navaratna
* Nazar battu
* Pichal Peri
* Puppy pregnancy syndrome
* Akabeko
* Kanai Anzen
* Maneki-neko
* Okiagari-koboshi
* Omamori
* Fan death
* Agimat
* Arbularyo
* Barang
* Kulam
* Lihi
* Pagtatawas
* Pasma
* Usog
* Kuman Thong
* Palad khik
* Takrut
* Nang Kwak
* White elephant
* Curse of 39
* Jin Chan
* Numbers in Chinese culture
* Superstitions of Malaysian Chinese

Europe|

* August curse
* Barbary macaques in Gibraltar
* Bayern-luck
* Blarney Stone
* Cimaruta
* Cornicello
* The Goodman's Croft
* Himmelsbrief
* Icelandic magical staves
* In bocca al lupo
* Kitchen witch
* Klabautermann
* Mooncalf
* Nazar
* Need-fire
* Painted pebbles
* Powder of sympathy
* Rabbit rabbit rabbit
* Ravens of the Tower of London
* Russian traditions and superstitions
* Spilling water for luck
* The Scottish Play
* Troll cross
* Tycho Brahe days
* Witch post
* Wolfssegen

General|

* 11
* 4 (Four-leaf clover, Tetraphobia)
* 7 (Seventh son of a seventh son)
* 8
* 9
* 13 (Friday the 13th, The Thirteen Club, Thirteenth floor, Triskaidekaphobia)
* 108
* 111
* 27 Club
* 666 (Number of the Beast)
* Ace of spades
* Auspicious wedding dates
* Baseball superstition
* Beginner's luck
* Black cat
* Bread and butter
* Break a leg
* Chain letter
* Cramp-ring
* Curse
* Davy Jones' Locker
* End-of-the-day betting effect
* Fear of frogs
* Fear of ghosts
* First-foot
* Flying Dutchman
* Four Eleven Forty Four
* Gambler's conceit
* Good luck charm
* Human sacrifice
* Jinx
* Knocking on wood
* Law of contagion
* Literomancy
* Lock of hair
* Maternal impression
* Miasma theory
* Nelson
* Numismatic charm
* Penny
* Rabbit's foot
* Rainmaking
* Ship sponsor
* Shoes on a table
* Sign of the horns
* Something old
* Spilling salt
* Three on a match
* Threshold
* Toi toi toi
* Wishing well
* Witch ball
* Witching hour

Related|

* Apotropaic magic
* Astrology and science
* Coincidence
* Debunker
* Divination
* Folk religion
* Fortune-telling
* Magic and religion
* Magical thinking
* Numerology
* Perceptions of religious imagery in natural phenomena
* Post hoc ergo propter hoc
* Traditional medicine
* Urban legend

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