The book is now available! 56
(another Prime Pages' Curiosity)
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56 = sigma(sigma(sigma(5+6))). 56 is the smallest multidigit number with this property and there is only one other. [Firoozbakht]


  Submitted: 2004-09-03 10:39:26;   Last Modified: 2009-05-08 20:59:20.

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