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313 (number) : ウィキペディア英語版 | 313 (number)
313 is an integer following 312 and preceding 314. 313 is a: * prime number * twin prime with 311 * centered square number * full reptend prime * pythagorean prime * regular prime * palindromic prime in both decimal and binary. * truncatable prime * weakly prime - in base 5 * happy number * Armstrong number - in base 4 ( 3×42 + 1×41 + 3×40 = 33 + 13 + 33 ) ==Religious significance==
In Islam, 313 is the number of Muslims who fought in the Battle of Badr and by extension, Islam's, foes. It was a decisive Muslim victory against a force of over 1,000 other men: the Muslims lost only 14 men. The battle also took place on March 13, or 3/13.
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