The book is now available! 59
(another Prime Pages' Curiosity)
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59 is the only known mutidigit number n (up to 6000) such that sigma(n^n) + n is prime. The prime related to the next such number (if it exists) has more than 22500 digits. [Firoozbakht]

 

  Submitted: 2009-06-07 05:00:05;   Last Modified: 2009-06-07 08:25:47.



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