
Curios:
Curios Search:
Participate: 
The only Xprime of order 5. (An Xprime is a palindromic prime of n^2 digits (n, odd > 2) arranged leftright, topdown, in an nbyn 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]
Prime Curios! © 20002018 (all rights
reserved)
privacy statement
