12255...55221 (49-digits)

This number is a prime.

122555553 3366666677 7777767777 7776666663 3355555221

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The smallest square-congruent prime of order 7 consisting of six positive digits d, i.e., (1, 2, 3, 5, 6, 7), 2*d times each of them and an extra digit in the middle. [Loungrides]

Submitted: 2010-10-07 17:17:24; Last Modified: 2018-04-03 11:45:41.