The book is now available! 172
(another Prime Pages' Curiosity)
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172 = phi(1+7+2) * prime(1*7*2). It is the only known number (up to 10^8) with this property. [Firoozbakht]

 

  Submitted: 2009-04-23 11:14:30;   Last Modified: 2009-04-23 15:47:02.



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