2013 Australian Federal Election, 2013 Federal Election
Thirteen or 13 may refer to: * 13 (number), the natural number following 12 and preceding 14 * One of the years 13 BC, AD 13, 1913 Events January * January 5 – First Balkan War: Battle of Lemnos (1913), Battle of Lemnos – Greek admiral Pavlos Kountouriotis forces the Turkish fleet to retreat to its base within the Dardanelles, from which it will not ven ..., 2013 Music * 13AD (band), an Indian classic and hard rock band Albums * 13 (Black Sabbath album), ''13'' (Black Sabbath album), 2013 * 13 (Blur album), ''13'' (Blur album), 1999 * 13 (Borgeous album), ''13'' (Borgeous album), 2016 * 13 (Brian Setzer album), ''13'' (Brian Setzer album), 2006 * 13 (Die Ärzte album), ''13'' (Die Ärzte album), 1998 * 13 (The Doors album), ''13'' (The Doors album), 1970 * 13 (Havoc album), ''13'' (Havoc album), 2013 * 13 (HLAH album), ''13'' (HLAH album), 1993 * 13 (Indochine album), ''13'' (Indochine album), 2017 * 13 (Marta Savić album), ''13'' (Marta Savić album), ...
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13 (number)
13 (thirteen) is the natural number following 12 and preceding 14. Strikingly folkloric aspects of the number 13 have been noted in various cultures around the world: one theory is that this is due to the cultures employing lunar-solar calendars (there are approximately 12.41 lunations per solar year, and hence 12 "true months" plus a smaller, and often portentous, thirteenth month). This can be witnessed, for example, in the "Twelve Days of Christmas" of Western European tradition. In mathematics The number 13 is the sixth prime number. It is a twin prime with 11, as well as a cousin prime with 17. It is the second Wilson prime, of three known (the others being 5 and 563), and the smallest emirp in decimal. 13 is: *The second star number: *The third centered square number: * A happy number and a lucky number. *A Fibonacci number, preceded by 5 and 8. *The smallest number whose fourth power can be written as a sum of two consecutive square numbers (1192 + 1202). *The s ...
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