131 (one hundred ndthirty-one) is the

natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''Cardinal n ...

following 130 and preceding 132.

In mathematics

131 is a

Sophie Germain prime In number theory, a prime number ''p'' is a if 2''p'' + 1 is also prime. The number 2''p'' + 1 associated with a Sophie Germain prime is called a . For example, 11 is a Sophie Germain prime and 2 × 11 + ...

, an

irregular prime In number theory, a regular prime is a special kind of prime number, defined by Ernst Kummer in 1850 to prove certain cases of Fermat's Last Theorem. Regular primes may be defined via the divisibility of either class numbers or of Bernoulli num ...

, the second 3-digit

palindromic prime In mathematics, a palindromic prime (sometimes called a palprime) is a prime number that is also a palindromic number. Palindromicity depends on the base of the number system and its notational conventions, while primality is independent of such ...

, and also a

permutable prime A permutable prime, also known as anagrammatic prime, is a prime number which, in a given base, can have its digits' positions switched through any permutation and still be a prime number. H. E. Richert, who is supposedly the first to study th ...

with

113 113 may refer to: *113 (number), a natural number *AD 113, a year * 113 BC, a year *113 (band), a French hip hop group * 113 (MBTA bus), Massachusetts Bay Transportation Authority bus route * 113 (New Jersey bus), Ironbound Garage in Newark and run ...

and 311. It can be expressed as the sum of three consecutive primes, 131 = 41 + 43 + 47. 131 is an

Eisenstein prime In mathematics, an Eisenstein prime is an Eisenstein integer : z = a + b\,\omega, \quad \text \quad \omega = e^, that is irreducible (or equivalently prime) in the ring-theoretic sense: its only Eisenstein divisors are the units , itself ...

with no imaginary part and real part of the form

3n - 1

. Because the next odd number, 133, is a

semiprime In mathematics, a semiprime is a natural number that is the product of exactly two prime numbers. The two primes in the product may equal each other, so the semiprimes include the squares of prime numbers. Because there are infinitely many prime nu ...

, 131 is a

Chen prime A prime number ''p'' is called a Chen prime if ''p'' + 2 is either a prime or a product of two primes (also called a semiprime). The even number 2''p'' + 2 therefore satisfies Chen's theorem. The Chen primes are named after Chen Jingru ...

. 131 is an

Ulam number In mathematics, the Ulam numbers comprise an integer sequence devised by and named after Stanislaw Ulam, who introduced it in 1964. The standard Ulam sequence (the (1, 2)-Ulam sequence) starts with ''U''1 = 1 and ''U''2 =&nbs ...

. 131 is a

full reptend prime In number theory, a full reptend prime, full repetend prime, proper primeDickson, Leonard E., 1952, ''History of the Theory of Numbers, Volume 1'', Chelsea Public. Co. or long prime in base ''b'' is an odd prime number ''p'' such that the Fermat q ...

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 Convair, previously Consolidated Vultee, was an American aircraft manufacturing company that later expanded into rockets and spacecraft. The company was formed in 1943 by the merger of Consolidated Aircraft and Vultee Aircraft. In 1953, it ...

C-131 Samaritan The Convair C-131 Samaritan is an American twin-engined military transport produced from 1954 to 1956 by Convair. It is the military version of the Convair CV-240 family of airliners.Gradidge 1997, p. 20–21. Design and development The design ...

was an American military transport produced from

1954 Events January * January 1 – The Soviet Union ceases to demand war reparations from West Germany. * January 3 – The Italian broadcaster RAI officially begins transmitting. * January 7 – Georgetown-IBM experiment: The fir ...

to 1956 * Strike Fighter Squadron (VFA-131) is a

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

F/A-18C Hornet The McDonnell Douglas F/A-18 Hornet is an all-weather, twin-engine, supersonic, carrier-capable, multirole combat aircraft, designed as both a fighter and attack aircraft (hence the F/A designation). Designed by McDonnell Douglas (now p ...

fighter squadron stationed at

Naval Air Station Oceana Naval Air Station (NAS) Oceana or NAS Oceana is a United States Navy Naval Air Station located in Virginia Beach, Virginia. Nowadays, the station is located on 23.9 km2. It has total of 250 aircraft deployed and buildings valued at $800 mil ...

Tiger 131 Tiger 131 is a German Tiger I heavy tank captured by the British 48th Royal Tank Regiment in Tunisia during World War II. Preserved at The Tank Museum in Bovington in Dorset, England, it is currently the only operational Tiger I in the world. G ...

is a German

Tiger I The Tiger I () was a German heavy tank of World War II that operated beginning in 1942 in Africa and in the Soviet Union, usually in independent heavy tank battalions. It gave the German Army its first armoured fighting vehicle that mounted ...

heavy tank Heavy tank is a term used to define a class of tanks produced from World War I through the end of the Cold War. These tanks generally sacrificed mobility and maneuverability for better armour protection and equal or greater firepower than tanks ...

captured in Tunisia by the British 48th Royal Tank Regiment during

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

* was a ''Mission Buenaventura''-class

fleet oiler A replenishment oiler or replenishment tanker is a naval auxiliary ship with fuel tanks and dry cargo holds which can supply both fuel and dry stores during underway replenishment (UNREP) at sea. Many countries have used replenishment oilers. The ...

during World War II * was a is a United States Navy ship during World War II * was a United States Navy * was a United States Navy ''General G. O. Squier''-class transport ship during World War II * was a United States Navy during World War II * was a United States Navy during World War II * was a ship of the United States Navy during World War II *

ZIL-131 The ZIL-131 is a general purpose 3.5 tonne 6x6 army truck designed in the Soviet Union by Zavod Imeni Likhacheva, ZIL. The basic model being a general cargo truck. Variants include a tractor-trailer truck, a dump truck, a fuel truck, and a 6x6 fo ...

is a 3.5-ton 6x6

army An army (from Old French ''armee'', itself derived from the Latin verb ''armāre'', meaning "to arm", and related to the Latin noun ''arma'', meaning "arms" or "weapons"), ground force or land force is a fighting force that fights primarily on ...

truck

In transportation

London Buses route 131 This is a list of Transport for London (TfL) contracted bus routes in London, England, as well as commercial services that enter the Greater London area (except coaches). Bus services in London are operated by Abellio London, Arriva Londo ...

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 STS-131 ( ISS assembly flight 19A) was a NASA Space Shuttle mission to the International Space Station (ISS). launched on 5 April 2010 at 6:21 am from LC-39A, and landed at 9:08 am on 20 April 2010 on runway 33 at the Kennedy Space C ...

is a

NASA The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding t ...

Contingency Logistic Flight (CLF) of the Space Shuttle ''Atlantis'' which launched in April 2010

In other fields

131 is also: * The year

AD 131 Year 131 ( CXXXI) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Laenas and Rufinus (or, less frequently, year 884 '' Ab urbe condita ...

or 131 BC * 131 AH is a year in the

Islamic calendar The Hijri calendar ( ar, ٱلتَّقْوِيم ٱلْهِجْرِيّ, translit=al-taqwīm al-hijrī), also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or ...

that corresponds to 748 – 749 CE. *

131 Vala Vala ( minor planet designation: 131 Vala) is an inner main-belt asteroid. It was discovered by C. H. F. Peters on 24 May 1873, and named after Völva, a prophetess in Norse mythology. One observation of an occultation of a star by Vala is fro ...

is an inner

main belt The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, called ...

asteroid An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere. ...

Iodine-131 Iodine-131 (131I, I-131) is an important radioisotope of iodine discovered by Glenn Seaborg and John Livingood in 1938 at the University of California, Berkeley. It has a radioactive decay half-life of about eight days. It is associated with nuc ...

, or

radioiodine There are 37 known isotopes of iodine (53I) from 108I to 144I; all undergo radioactive decay except 127I, which is stable. Iodine is thus a monoisotopic element. Its longest-lived radioactive isotope, 129I, has a half-life of 15.7 million year ...

, is a

radioisotope A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is a nuclide that has excess nuclear energy, making it unstable. This excess energy can be used in one of three ways: emitted from the nucleus as gamma radiation; transferr ...

iodine Iodine is a chemical element with the symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at , and boils to a vi ...

for medical and pharmaceutical use *

ACP-131 ACP-131 is the controlling publication for the listing of Q codes and Z codes. It is published by the Combined Communications Electronics Board (CCEB) countries (Australia, New Zealand, Canada, United Kingdom and United States), and revised from t ...

is the controlling publication for listing of

Q code The Q-code is a standardised collection of three-letter codes that each start with the letter "Q". It is an operating signal initially developed for commercial radiotelegraph communication and later adopted by other radio services, especially ...

s and

Z code Z (or z) is the 26th and last letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its usual names in English are ''zed'' () and ''zee'' (), with an occasi ...

s, as published by NATO Allied countries * Sonnet 131 by

William Shakespeare William Shakespeare ( 26 April 1564 – 23 April 1616) was an English playwright, poet and actor. He is widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's nation ...

* 131 is the medical

emergency telephone number Most public switched telephone networks have a single emergency telephone number (sometimes known as the universal emergency telephone number or the emergency services number) that allows a caller to contact local emergency services for assista ...

Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...

United States Citizenship and Immigration Services U.S. Citizenship and Immigration Services (USCIS) is an agency of the United States Department of Homeland Security (DHS) that administers the country's naturalization and immigration system. It is a successor to the Immigration and Naturalizati ...

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 Indie is a short form of "independence" or "independent"; it may refer to: Arts, entertainment, and media Gaming *Independent video game development, video games created without financial backing from large companies *Indie game, any game (board ...

music

References

{{DEFAULTSORT:131 (Number) Integers

In mathematics

In the military

In transportation

In other fields

See also

References