The book is now available! 47
(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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47 is the first and only prime p less than 20000 of the form p*2^(p+1)-1, where p is prime. [Luhn]


  Submitted: 2001-09-20 11:48:12;   Last Modified: 2008-01-30 11:28:00.

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