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The only X-prime of order 5. (An X-prime is a palindromic prime of n^2 digits (n, odd > 2) arranged left-right, top-down, in an n-by-n array, where the digits of the two diagonals are equal to a and all the other digits are equal to b different from a). [Loungrides]


  Submitted: 2009-08-26 10:26:42;   Last Modified: 2009-08-26 14:17:56.

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