281

This number is a prime.

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Wilfred Whiteside of Houston, Texas, discovered the following 7-by-7 array in which 281 primes can be found:

 3 1 3 7 3 3 9
 9 9 2 3 3 3 3
 6 9 7 7 8 9 4
 7 6 1 5 9 1 9
 7 7 3 4 2 1 1
 9 9 4 7 9 3 9
 3 3 7 1 9 9 9.

Submitted: 2004-08-13 00:47:46; Last Modified: 2009-03-10 01:10:29.