“131 (number)”的意思、由来-开放百科全书

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131 (number)

释义

In mathematics
In the military
In transportation
In other fields
See also
References

{{example farm|date=April 2016}}{{Infobox number
| number = 131
| factorization = prime
| prime = 32nd
| divisor = 1, 131
}}

131 (one hundred [and] thirty-one) is the natural number following 130 and preceding 132.

In mathematics

131 is a Sophie Germain prime,^[1] an irregular prime,^[2] the second 3-digit palindromic prime, and also a permutable prime with 113 and 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

. Because the next odd number, 133, is a semiprime, 131 is a Chen prime. 131 is an Ulam number.^[3]

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

In the military

Convair C-131 Samaritan was an American military transport produced from 1954 to 1956
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 planned for no earlier than February 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 – 749 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 codes and Z codes, 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 Indie music

References

1. ^{{Cite web|url=https://oeis.org/A005384|title=Sloane's A005384 : Sophie Germain primes|last=|first=|date=|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-27}}
2. ^{{Cite web|url=https://oeis.org/A000928|title=Sloane's A000928 : Irregular primes|last=|first=|date=|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-27}}
3. ^{{Cite web|url=https://oeis.org/A002858|title=Ulam numbers|last=|first=|date=2016-04-18|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-04-19}}

1 : Integers

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In mathematics

In the military

In transportation

In other fields

See also

References