The book is now available! 53
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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It is possible to place eight queens on a standard chessboard in which only 53 squares are under attack. Is this the minimum solution? [Madachy]


  Submitted: 2008-03-19 21:36:23;   Last Modified: 2009-03-12 20:14:42.

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