# 131333131

$t_title is "131333131"

$t_adjust_path is "/~caldwell/curios/"

$t_class is "prime"

$short is "131333131"

$nunber_id is "9259"

$t_meta['description'] is "One of many pages of prime number
curiosities and trivia. This page discusses 131333131
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The smallest "plus sign prime."

1A31333131

*plus sign 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 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]

(There is one curio for this number that has not yet been approved by an editor.)

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