840s BC Deaths
84 may refer to: * 84 (number) * one of the years 84 BC, AD 84, 1984, AD 2084 * Eighty Four, Pennsylvania, an unincorporated census-designated place in Washington County, Pennsylvania, United States * Seksendört Seksendört (also known as Grup 84) is a Turkish pop rock band from Ankara. Seksendört consists of Tuna Velibaşoğlu, Arif Erdem Ocak, Serter Karadeniz, and Okan Özen. The band was formed in 1999 and started getting noticed under the name 'Sek ..., a Turkish pop group whose name means 84 See also * * List of highways numbered {{Numberdis ...
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84 (number)
84 (eighty-four) is the natural number following 83 and preceding 85. In mathematics 84 is: * the sum of the first seven triangular numbers (making it a tetrahedral number). * a Dodecahedral number. * the sum of a twin prime (41 + 43). * a semiperfect number, being thrice a perfect number. * a palindromic number and a repdigit in bases 11 (7711), 13 (6613), 20 (4420), 27 (3327), and 41 (2241). * the lim sup of the largest finite subgroup of the mapping class group of a genus ''g'' surface divided by ''g''. A hepteract is a seven-dimensional hypercube with 84 penteract 5-faces. In astronomy *Messier object M84, a magnitude 11.0 lenticular galaxy in the constellation Virgo *The New General Cataloguebr>object NGC 84, a single star in the constellation Andromeda In other fields Eighty-four is also: * The year AD 84, 84 BC, or 1984. * The number of years in the , a cycle used in the past by Celtic peoples, equal to 3 cycles of the Julian Calendar and to 4 Metonic ...
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