The book is now available! 19
(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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Both numbers reversal(19! - 1) and reversal(19! + 1) are primes. 19 is the largest known prime with this property. [Firoozbakht]


  Submitted: 2009-10-21 20:12:08;   Last Modified: 2009-11-02 19:43:54.

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