61

This number is a prime.

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The first of five consecutive primes that can be arranged in a 3-by-3 square whose columns and rows sum to consecutive primes (199, 211, 223):

   61  67  71 

   67  71  73 

   71  73  79.

Submitted: 2009-08-18 21:32:33; Last Modified: 2009-08-22 17:36:37.