The book is now available! 107
(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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There are exactly 107 hole-free heptominoes (polyominoes made up of seven squares connected edge-to-edge). [Beedassy]


  Submitted: 2006-07-26 17:24:47;   Last Modified: 2009-03-12 14:17:08.

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