The book is now available! 6
(another Prime Pages' Curiosity)
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6 is probably the only even number n such that both numbers n^n - (n+1) and n^n + (n+1) are primes. [Firoozbakht]

 

  Submitted: 2009-06-13 21:40:25;   Last Modified: 2009-06-13 21:51:05.



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