129 (number)

	[[{{#expr: (floor({{{number}}} div {{{factor}}})) * {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}}}}]] [[{{#expr: (floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}{{{factor}}} div 10)}} (number)\|{{#switch:{{{1}}}\|-1={{#ifexpr:(floor({{{number}}} div 10)) = 0\|-1\|←}}\|10=→\|#default={{#expr:(floor({{{number}}} div {{{factor}}})) {{{factor}}}+({{{1}}}*{{{factor}}} div 10)}}}}]] 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.

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: $11^{2}+2^{2}+2^{2}$ , $10^{2}+5^{2}+2^{2}$ , $8^{2}+8^{2}+1^{2}$ , and $8^{2}+7^{2}+4^{2}$ .

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]

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
USS Donald W. Wolf (APD-129) was a Crosley-class high speed transport of the United States Navy
USS Edsall (DE-129) was the lead ship of her class of destroyer escort in the United States Navy
USS Marvin H. McIntyre (APA-129) was a United States Navy Haskell-class attack transport during World War II
USS Phobos (AK-129) was a United States Navy Crater-class cargo ship during World War II
USS Vital (AM-129) was a United States Navy Auk-class minesweeper for removing naval mines laid in the water

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 AD129 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

References

↑ "Sloane's A016105 : Blum integers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
↑ "Sloane's A007770 : Happy numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.

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[1] "Sloane's A016105 : Blum integers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.

[2] "Sloane's A007770 : Happy numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.