The book is now available! 4226
(another Prime Pages' Curiosity)
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4226 = phi(4)^sigma(4) + phi(2)^sigma(2) + phi(2)^sigma(2) + phi(6)^sigma(6). Note that 4226 is the earliest multi-digit number with this property. [Firoozbakht]

 

  Submitted: 2004-09-22 07:24:29;   Last Modified: 2008-01-30 11:28:00.



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