668273

This number is a prime.

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The number of solutions to the 26-variable equation: 1A + 2B + 3C + 4D + 5E + ... + 26Z = 1, where each variable A, B, C, ..., Z, is either +1 or -1. [Post]

Submitted: 2007-11-25 05:33:14; Last Modified: 2008-04-14 03:34:33.