717

This number is a composite.

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717 is the largest three-digit palindrome such that if it is raised to the sum of its digits plus the sum of its digits plus one, the result is prime. I.e., 717^(7+1+7)+(7+1+7)+1 is prime. [Opao]

Submitted: 2003-12-15 03:48:54; Last Modified: 2008-01-30 17:28:00.