9551

This number is a prime.

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The largest prime found in the following array: 
 9 1 3 3
 1 5 8 3
 7 5 2 9
 3 9 1 1.
Every row, column, and main diagonal is a different emirp. Ignoring rotations, it is the only possible 4-by-4 prime magic square of this type.

Submitted: 2007-01-26 20:44:49;   Last Modified: 2008-01-30 17:28:00.
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