The book is now available! 2951
(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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The number of right-truncatable semiprimes less than 109. Note that 2951 (13 x 227) is a semiprime. [Pfoertner]


  Submitted: 2003-07-23 15:15:02;   Last Modified: 2014-07-20 22:55:17.

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