The book is now available! 221
(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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221^221 + reversal(221) is prime. It is the only known number greater than 1 with this property. [Firoozbakht]


  Submitted: 2009-10-13 15:55:03;   Last Modified: 2009-10-13 17:55:57.

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