The book is now available! 6517
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The sum of digits of 6517 = 7^3 * 19 equals its largest prime factor. Both 6^4 + 5^3 + 1^2 + 7^1 and 6! + 5! + 1! + 7! are also primes. [Post]

 

  Submitted: 2009-07-08 01:32:18;   Last Modified: 2009-07-08 06:42:30.



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