12277...77777 (125-digits)

This number is a prime.

                12277 7777777777 7777777777 7777777777 7777777777 7777777777
7777777777 7777777777 7777777777 7777777777 7777777777 7777777777 7777777777

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The smallest prime greater than a googol consisting of a number n followed by n 7's. [Loungrides]