The book is now available! 56
(another Prime Pages' Curiosity)
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prime(56) = prime(5)*prime(6)+sigma(56). 56 is the only known number (up to 3*10^8) with this property. [Firoozbakht]

 

  Submitted: 2009-05-10 06:20:41;   Last Modified: 2009-05-10 11:21:13.



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