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Single Curio View: (Seek other curios for this number) The smallest "plus sign prime." 1 3 1 3 3 3 1 3 1A plus sign prime is a palindromic prime of n^2 digits (n, odd > 2) arranged leftright, topdown, in an nbyn array, where the central row and column make a plus sign (+) and consist of identical digits b. The other digits of the array are identical digits different from b. Thus, an order 3 plus sign prime is of the form ababbbaba, order 5 of the form aabaaaabaabbbbbaabaaaabaa, etc. [Loungrides]
Submitted: 20090804 09:57:18; Last Modified: 20090824 17:45:56.
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