Friday, July 5, 2013

651

651 = 3 x 7 x 31.

651 is a pentagonal number and a nonagonal number. It is the smallest number that is both pentagonal and nonagonal.

651 is 10101 in base 5 and 3003 in base 6.

651 is the number of binary trees of height 4.

651 has a fourth power that is the sum of four fourth powers.

101,556 = 372 x 273 = 651 x 156.


Source: Number Gossip

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