77777...77723 (25-digits)

This number is a prime.

77777 7777777777 7777777723

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The largest prime, less than a googol, formed by n 7's followed by the integer n (n=23). [Loungrides]

Submitted: 2008-12-30 11:06:24; Last Modified: 2008-12-31 18:17:54.