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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The only “zeta prime” of order 7. (A zetaprime is a palindromic prime of n^2 digits (n, odd > 2) arranged leftright, topdown, in an nbyn array, where the first and the last row with the second diagonal make the letter Z and are consisting of identical digits a. The other digits of the array are also identical digits different from a. Thus, an order 7 zetaprime is of the form aaaaaaabbbbbabbbbbabbbbbabbbbbabbbbbabbbbbaaaaaaaa.) [Loungrides]
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