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Wikipedia definition
1. 313 (number)313 is an integer following 312 and preceding 314. 313 is a: prime number twin prime with 311 centered square number long prime pythagorean prime regular prime palindromic prime in both decimal and binary. truncatable prime happy number Armstrong number - in base 4 (3×4 + 1×4 + 3×4 = 3 + 1 + 3)
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