17777...77771 (49-digits)

This number is a prime.

                       177777777 7777777777 7777777777 7777777777 7777777771

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The only square-congruent plateau prime of order 7. [Loungrides]

Submitted: 2010-03-05 17:53:50;   Last Modified: 2014-08-30 15:16:45.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell