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613 (number) : ウィキペディア英語版 | 613 (number)
Six hundred (and) thirteen is the natural number following six hundred (and) twelve and preceding six hundred (and) fourteen. ==Mathematical properties== 613 is a prime number, the first number of prime triplet (''p'', ''p'' + 4, ''p'' + 6), middle number of sexy prime triple (''p'' − 6, ''p'', ''p'' + 6). It is the index of a prime Lucas number.〔(What's Special About This Number? )〕 613 is a centered square number with 18 per side, a circular number of 21 with a square grid and 27 using a triangular grid. It is also 17-gonal. 613 is the sum of squares of two consecutive integers, 17 and 18, and is also a lucky number and thus a lucky prime.
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