The book is now available! 251429
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 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]

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