Wednesday, January 16, 2013

871

871 = 13 x 67.

871 = 4! + 5! + 3! + 6! + 1! and 45,361 = 8! + 7! + 1!

871 is 31213 in base 4.

871 is a central, polygonal number (A002061). It is also a tridecagonal number (A051865).

871 has the representation 2533 + 7.

871 is a divisor of 662 - 1.


Source: On-Line Encyclopedia of Integer Sequences

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