93 (number)

Short description: Natural number

| <- 92  | 93 |  94 ->

|
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← 90 91 92 93 94 95 96 97 98 99 →

List of numbers — Integers

← 0 10 20 30 40 50 60 70 80 90 →

Cardinal| ninety-three
Ordinal| 93rd
(ninety-third)
Factorization| 3 × 31
Divisors| 1, 3, 31, 93
Greek numeral| ϞΓ´
Roman numeral| XCIII
Binary| 10111012
Ternary| 101103
Quaternary| 11314
Quinary| 3335
Senary| 2336
Octal| 1358
Duodecimal| 7912
Hexadecimal| 5D16
Vigesimal| 4D20
Base 36| 2L36

93 (ninety-three) is the natural number following 92 and preceding 94.

## Contents

* 1 In mathematics
* 2 In other fields
* 3 See also
* 4 References
* 5 External links

## In mathematics

93 is:

* the 28th distinct semiprime[1] and the 9th of the form (3.q) where q is a higher prime.[2]
* the first number in the 3rd triplet of consecutive semiprimes, 93, 94, 95.[3]
* with an aliquot sum of 35; itself a semiprime, within an aliquot sequence (93,35,13,1,0) of three numbers to the Prime 13 in the 13-Aliquot tree.
* a Blum integer, since its two prime factors, 3 and 31 are both Gaussian primes.[4]
* a repdigit in base 5 (3335),[5] and 30 (3330).
* palindromic in bases 2, 5, and 30.
* a lucky number.[6]
* a cake number.[7]
* an idoneal number.[8]

There are 93 different cyclic Gilbreath permutations on 11 elements,[9] and therefore there are 93 different real periodic points of order 11 on the Mandelbrot set.[10]

## In other fields

Ninety-three is:

* The atomic number of neptunium, an actinide.
* The code for international direct dial phone calls to Afghanistan.
* One of two ISBN Group Identifiers for books published in India .
* The number of the French department Seine-Saint-Denis, a Paris suburb with high proportions of immigrants and low-income people, and as such used by many French rappers and those emulating their speech.[11][12]

In classical Persian finger counting, the number 93 is represented by a closed fist. Because of this, classical Arab and Persian poets around 1 CE referred to someone's lack of generosity by saying that the person's hand made "ninety-three".[13]

## See also

* AD 93, a year in the Julian calendar
* List of highways numbered 93
* Ninety-Three (Quatrevingt-treize), a novel concerning the French Revolution by Victor Hugo
* 93 (Thelema), a greeting among Thelemites based on the numerological (gematric) value of Thelema (Will) and Agape (Love) in Greek letters.[14]
* Babia 93, an album from a Pakistani pop singer Sajjad Ali
* London's 93 Feet East music venue
* Current 93, a musical project of David Tibet
* Los Angeles 93 KHJ radio
* United Airlines Flight 93, one of the airplanes hijacked on September 11, 2001.
* 93 'til Infinity, the debut album by Oakland hip hop group Souls of Mischief.

## References

1. ↑ Sloane, N. J. A., ed. "Sequence A001358". OEIS Foundation. https://oeis.org/A001358.
2. ↑ Sloane, N. J. A., ed. "Sequence A001748". OEIS Foundation. https://oeis.org/A001748.
3. ↑ Sloane, N. J. A., ed. "Sequence A056809". OEIS Foundation. https://oeis.org/A056809.
4. ↑ Sloane, N. J. A., ed. "Sequence A016105". OEIS Foundation. https://oeis.org/A016105.
5. ↑ Sloane, N. J. A., ed. "Sequence A048330". OEIS Foundation. https://oeis.org/A048330.
6. ↑ Sloane, N. J. A., ed. "Sequence A000959". OEIS Foundation. https://oeis.org/A000959.
7. ↑ Sloane, N. J. A., ed. "Sequence A000125". OEIS Foundation. https://oeis.org/A000125.
8. ↑ Sloane, N. J. A., ed. "Sequence A000926". OEIS Foundation. https://oeis.org/A000926.
9. ↑ Sloane, N. J. A., ed. "Sequence A000048". OEIS Foundation. https://oeis.org/A000048.
10. ↑ Diaconis, Persi; Graham, Ron (2012), "Chapter 5: From the Gilbreath Principle to the Mandelbrot Set", Magical Mathematics: the mathematical ideas that animate great magic tricks, Princeton University Press, pp. 61–83 .
11. ↑ Durand, Alain-Philippe (2002), Black, Blanc, Beur: Rap Music and Hip-Hop Culture in the Francophone World, Scarecrow Press, p. 55, ISBN 9780810844315, https://books.google.com/books?id=cMq4ni2BQowC&pg=PA55 .
12. ↑ Meltzer, Marisa; Shepherd, Julianne (March 2006), "Spitting Fire", Spin: 76–81, https://books.google.com/books?id=J98-LX7jemQC&pg=RA1-PT5 .
13. ↑ Bloom, Jonathan M. (Spring 2002), "Hand sums: The ancient art of counting on your fingers", Boston College Magazine, http://bcm.bc.edu/issues/spring_2002/ll_hand.html .
14. ↑ Campbell, Colin D. (2018). Thelema: an introduction to the life, work & philosophy of Aleister Crowley. Woodbury, Minnesota. ISBN 9780738755236.

## External links

* On the Number 93

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