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31 may refer to: *
31 (number) 31 (thirty-one) is the natural number following thirty, 30 and preceding 32 (number), 32. It is a prime number. In mathematics 31 is the 11th prime number. It is a superprime and a Self number#Self primes, self prime (after 3, 5, and 7), as no ...


Years

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31 BC __NOTOC__ Year 31 BC was either a common year starting on Tuesday, Wednesday or Thursday or a leap year starting on Tuesday or Wednesday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for ...
* AD 31 *
1931 Events January * January 2 – South Dakota native Ernest Lawrence invents the cyclotron, used to accelerate particles to study nuclear physics. * January 4 – German pilot Elly Beinhorn begins her flight to Africa. * January 22 – Sir I ...
CE ('31) *
2031 The 2030s (pronounced "twenty-thirties"; shortened to the '30s) is the next decade in the Gregorian calendar that will begin on 1 January 2030, and will end on 31 December 2039. Plans and goals * NASA plans to execute a crewed mission to Mars be ...
CE ('31)


Music

* ''Thirty One'' (Jana Kramer album), 2015 * ''Thirty One'' (Jarryd James album), 2015 * "Thirty One", a song by Karma to Burn from the album '' Wild, Wonderful Purgatory'', 1999


Science

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Gallium Gallium is a chemical element with the symbol Ga and atomic number 31. Discovered by French chemist Paul-Émile Lecoq de Boisbaudran in 1875, Gallium is in group 13 of the periodic table and is similar to the other metals of the group (aluminiu ...
, a post-transition metal in the periodic table *
31 Euphrosyne Euphrosyne ( minor planet designation: 31 Euphrosyne) is a very young asteroid. It is the one of the largest asteroids (approximately tied for 7th place, to within measurement uncertainties). It was discovered by James Ferguson on September 1, 1 ...
, an asteroid in the asteroid belt * (31) Euphrosyne I, a satellite of
31 Euphrosyne Euphrosyne ( minor planet designation: 31 Euphrosyne) is a very young asteroid. It is the one of the largest asteroids (approximately tied for 7th place, to within measurement uncertainties). It was discovered by James Ferguson on September 1, 1 ...


Film and television

* ''31'' (film), a 2016 horror film *
31 (Kazakhstan) Channel 31 is a Kazakh nationwide broadcast television station that is based in Almaty, Kazakhstan and are owned and operated by CTC Media anNational Media Group The channel was launched on 24 October 1992, and during its official start, it h ...
, a television channel *
31 Digital 31 may refer to: * 31 (number) Years * 31 BC * AD 31 * 1931 CE ('31) * 2031 CE ('31) Music * ''Thirty One'' (Jana Kramer album), 2015 * ''Thirty One'' (Jarryd James album), 2015 * "Thirty One", a song by Karma to Burn from the album ''W ...
, an Australian video on demand service


Transportation

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31st (CTA station) 31st was a station on the Chicago Transit Authority's South Side Main Line, which is now part of the Green Line. The station was located at 31st Street near State Street in the Douglas Douglas may refer to: People * Douglas (given name) * Do ...
, a rapid transit station in Chicago *
31 (MBTA bus) The Massachusetts Bay Transportation Authority bus division operates bus routes in the Boston, Massachusetts metropolitan area. All routes connect to MBTA subway, MBTA Commuter Rail, and/or other MBTA bus services. Many routes are descendants ...
, a bus route in Boston, Massachusetts *
31 (RIPTA) The Rhode Island Public Transit Authority (RIPTA) provides public transportation, primarily buses, in the state of Rhode Island. The main hub of the RIPTA system is Kennedy Plaza, a large bus terminal in downtown Providence, Rhode Island. In ...
, a bus route in Rhode Island


Other uses

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Thirty-one (card game) Thirty-one or Trente et un is a gambling card game played by two to seven people, where players attempt to assemble a hand which totals 31. Such a goal has formed the whole or part of various games like Commerce, Cribbage, Trentuno, and Wit and ...


See also

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Channel 31 (disambiguation) Channel 31 refers to several television stations: Australia The colloquial name for certain community television stations in Australia * Access 31 * Hitchhike TV, formerly 31 Digital * C31 Melbourne * Channel 31 (Sydney) * Channel 44 (Adelaide) ...
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Section 31 (disambiguation) Section 31 may refer to: * Section 31 (''Star Trek''), a fictional organization ** '' Star Trek: Section 31'', a novel series about the organization ** '' ''Star Trek: Section 31'' (TV series)'', an upcoming television series * Section 31 of the ...
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List of highways numbered 31 The following highways are numbered 31: International * Asian Highway 31 * European route E31 Australia * Hume Highway ** Hume Motorway ** Hume Freeway * - South Australia ** Gorge Road ** Little Para Road ** South Para Road ** Lyndoch Val ...
{{number disambiguation