129 (number)

Short description: Natural number

| <- 128  | 129 |  130 ->

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← 120 121 122 123 124 125 126 127 128 129 →

List of numbers — Integers

← 0 100 200 300 400 500 600 700 800 900 →

Cardinal| one hundred twenty-nine
Ordinal| 129th
(one hundred twenty-ninth)
Factorization| 3 × 43
Divisors| 1, 3, 43, 129
Greek numeral| ΡΚΘ´
Roman numeral| CXXIX
Binary| 100000012
Ternary| 112103
Quaternary| 20014
Quinary| 10045
Senary| 3336
Octal| 2018
Duodecimal| A912
Hexadecimal| 8116
Vigesimal| 6920
Base 36| 3L36

129 (one hundred [and] twenty-nine) is the natural number following 128 and preceding 130.

## Contents

* 1 In mathematics
* 2 In the military
* 3 In transportation
* 4 In other fields
* 5 See also
* 6 References

## In mathematics

129 is the sum of the first ten prime numbers. It is the smallest number that can be expressed as a sum of three squares in four different ways: 112+22+22, 102+52+22, 82+82+12, and 82+72+42.

129 is the product of only two primes, 3 and 43, making 129 a semiprime. Since 3 and 43 are both Gaussian primes, this means that 129 is a Blum integer.[1]

129 is a repdigit in base 6 (333).

129 is a happy number.[2]

129 is a centered octahedral number.[3]

## In the military

* Raytheon AGM-129 ACM (Advanced Cruise Missile) was a low observable, sub-sonic, jet-powered, air-launched cruise missile used by the United States Air Force
* Soviet submarine K-129 (1960) was a Soviet Pacific Fleet nuclear submarine that sank in 1968
* USNS Mission San Miguel (T-AO-129) was a United States Navy Mission Buenaventura-class fleet oilers during World War II
* Engineering:USS Donald W. Wolf (APD-129) was a Crosley-class high speed transport of the United States Navy
* Engineering:USS Edsall (DE-129) was the lead ship of her class of destroyer escort in the United States Navy
* Engineering:USS Marvin H. McIntyre (APA-129) was a United States Navy Haskell-class attack transport during World War II
* Engineering:USS Phobos (AK-129) was a United States Navy Crater-class cargo ship during World War II
* Engineering:USS Vital (AM-129) was a United States Navy Auk-class minesweeper for removing naval mines laid in the water
* Agusta A129 Mangusta is an attack helicopter originally designed and produced by Italian company Agusta
* The 129th Rescue Wing (129 RQW) is a unit of the California Air National Guard

## In transportation

* LZ 129 Hindenburg was a German zeppelin which went up in flames while landing on May 6, 1937
* London Buses route 129 is a Transport for London contracted bus route in London
* STS-129 was a Space Shuttle mission to the International Space Station, flown in November 2009 by the shuttle Atlantis.

## In other fields

129 is also:

* The year AD 129 or 129 BC
* 129 AH is a year in the Islamic calendar that corresponds to 746-747 CE
* 129 Antigone is a main belt asteroid
* The atomic number of unbiennium, an element yet to be discovered
* A film format: 129 film
* Sonnet 129 by William Shakespeare

## See also

* List of highways numbered 129
* United Nations Security Council Resolution 129

## References

1. ↑ "Sloane's A016105 : Blum integers". OEIS Foundation. https://oeis.org/A016105.
2. ↑ "Sloane's A007770 : Happy numbers". OEIS Foundation. https://oeis.org/A007770.
3. ↑ Sloane, N. J. A., ed. "Sequence A001845 (Centered octahedral numbers (crystal ball sequence for cubic lattice))". OEIS Foundation. https://oeis.org/A001845. Retrieved 2022-06-02.

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