34343...77777 (48-digits)

This number is a prime.

34343434 3434347777 7777777777 7777777777 7777777777

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The largest prime less than a googol of the form 7 ns followed by n 7s (n = 34). [Marcel]

Submitted: 2026-05-16 13:05:23; Last Modified: 2026-05-16 17:32:56.