The book is now available! 484
(another Prime Pages' Curiosity)
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sigma(484) = prime(4)*prime(8)*prime(4). 484 is the largest known (up to 10^8) such number. [Firoozbakht]

 

  Submitted: 2009-04-20 10:57:54;   Last Modified: 2009-04-20 15:33:32.


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