Thursday, March 8, 2012

865

865 = 5 x 173.

865 has two representations as a sum of two squares: 865 = 92 + 282 = 172 + 242.

865 is the hypotenuse of two primitive Pythagorean triples: 8652 = 2872 + 8162 = 5042 + 7032.

865 is 717 in base 11 and 151 in base 27.

865 is the sum of distinct factorials (A059590): 865 = 6! + 5! + 4! + 1!


Source: On-Line Encyclopedia of Integer Sequences

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