View source for 131 (number)

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{{Infobox number
| number = 131
| factorization = [[Prime number|prime]]
| prime = 32nd
| divisor = 1, 131
}}
'''131''' ('''one hundred [and] thirty-one''') is the [[natural number]] following [[130 (number)|130]] and preceding [[132 (number)|132]].

==In mathematics==
'''131''' is a [[Sophie Germain prime]],<ref>{{Cite web|url=https://oeis.org/A005384|title=Sloane's A005384 : Sophie Germain primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-27}}</ref> an [[irregular prime]],<ref>{{Cite web|url=https://oeis.org/A000928|title=Sloane's A000928 : Irregular primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-27}}</ref> the second 3-digit [[palindromic prime]], and also a [[permutable prime]] with [[113 (number)|113]] and [[311 (number)|311.]] It can be expressed as the sum of three consecutive primes, 131 = 41 + 43 + 47. 131 is an [[Eisenstein prime]] with no imaginary part and real part of the form <math>3n - 1</math>. Because the next odd number, 133, is a [[semiprime]], 131 is a [[Chen prime]]. 131 is an [[Ulam number]].<ref>{{Cite web|url=https://oeis.org/A002858|title=Ulam numbers|date=2016-04-18|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-04-19}}</ref>

131 is a [[full reptend prime]] in [[base (exponentiation)|base]] 10 (and also in [[base 2]]). The decimal expansion of 1/131 repeats the digits 007633587786259541984732824427480916030534351145038167938931 297709923664122137404580152671755725190839694656488549618320 6106870229 indefinitely.

131 is the fifth discriminant of imaginary [[quadratic field]]s with class number 5, where the 131st prime number 739 is the fifteenth such discriminant.<ref>{{Cite OEIS |A046002 |Discriminants of imaginary quadratic fields with class number 5 (negated) |access-date=2024-08-03 }}</ref> Meanwhile, there are conjectured to be a total of 131 discriminants of class number 8 (only one more discriminant could exist).<ref>{{Cite OEIS |A046005 |Discriminants of imaginary quadratic fields with class number 8 (negated). |access-date=2024-08-03 }}</ref>

==In the military==
* [[Convair]] [[C-131 Samaritan]] was an American military transport produced from [[1954 in aviation|1954]] to [[1956 in aviation|1956]]
* [[VFA-131|Strike Fighter Squadron (VFA-131)]] is a [[United States Navy]] [[F/A-18C Hornet]] fighter squadron stationed at [[Naval Air Station Oceana]]
* [[Tiger 131]] is a German [[Tiger I]] [[heavy tank]] captured in Tunisia by the British [[48th Royal Tank Regiment]] during [[World War II]]
* {{USNS|Mission Santa Barbara|T-AO-131}} was a ''Mission Buenaventura''-class [[fleet oiler]] during World War II
* {{USS|Bandera|APA-131}} was a is a United States Navy {{sclass|Haskell|attack transport|1}} ship during World War II
* {{USS|Buchanan|DD-131}} was a United States Navy {{sclass|Wickes|destroyer|1}}
* {{USS|General T. H. Bliss|AP-131}} was a United States Navy ''General G. O. Squier''-class transport ship during World War II
* {{USS|Hammann|DE-131}} was a United States Navy {{sclass|Edsall|destroyer escort|1}} during World War II
* {{USS|Melucta|AK-131}} was a United States Navy {{sclass|Crater|cargo ship|1}} during World War II
* {{USS|Walter X. Young|APD-131}} was a ship of the United States Navy during World War II
* [[ZIL-131]] is a 3.5-ton 6x6 [[army]] truck

==In transportation==
* [[London Buses route 131]] is a [[Transport for London]] contracted bus route in London
* The [[Fiat 131]] Mirafiori small/medium family car produced from 1974 to 1984
* [[STS-131]] is a [[NASA]] Contingency Logistic Flight (CLF) of the [[Space Shuttle Atlantis|Space Shuttle ''Atlantis'']] which launched in April 2010

==In other fields==
'''131''' is also:
* The year [[AD 131]] or [[131 BC]]
* 131 AH is a year in the [[Islamic calendar]] that corresponds to [[748]] &ndash; [[749]] [[Common Era|CE]].
* [[131 Vala]] is an inner [[main belt]] [[asteroid]]
* [[Iodine-131]], or [[radioiodine]], is a [[radioisotope]] of [[iodine]] for medical and pharmaceutical use
* [[ACP-131]] is the controlling publication for listing of [[Q code]]s and [[Z code]]s, as published by NATO Allied countries
* [[Sonnet 131]] by [[William Shakespeare]]
* 131 is the medical [[emergency telephone number]] in [[Chile]]
* [[United States Citizenship and Immigration Services]] Form I-131 to apply for a travel document, reentry permit, refugee travel document or advance parole
* 131 is the [[ID3v1]] tag equivalent to [[Independent music|Indie]] music

== See also ==
* [[List of highways numbered 131]]
* [[United Nations Security Council Resolution 131]]

{{Integers|1}}

==References==
{{Reflist}}

{{DEFAULTSORT:131 (Number)}}
[[Category:Integers]]

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USS General T. H. Bliss (AP-131) (edit)
USS Hammann (DE-131) (edit)
USS Melucta (AK-131) (edit)
USS Walter X. Young (APD-131) (edit)
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