The book is now available! 2501
(another Prime Pages' Curiosity)
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The product of the only two primes (41 and 61) that can be the last two digits of a perfect fourth power. If you replace the 5 by a 4, you get a fourth power (2401).

 

  Submitted: 2004-04-18 19:44:33;   Last Modified: 2008-01-30 11:28:00.



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