251429

This number is a prime.

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Four of the first 5 values are primes, up through this one, of partial sums of number of inequivalent ways of choosing n squares from an n-by-n board, considering rotations and reflections to be the same. After these (3, 19, 271, 251429) there are no more through 20-by-20. [Post]

Submitted: 2010-03-03 07:29:09;   Last Modified: 2010-03-03 16:12:45.
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