The book is now available! 15857
(another Prime Pages' Curiosity)
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15857 = prime(1*5*8*5*7) + phi(1*5*8*5*7) + sigma(1*5*8*5*7). It is the only known number with this property. [Firoozbakht]

 

  Submitted: 2009-08-01 23:41:23;   Last Modified: 2009-08-02 00:17:53.



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