11111...77777 (25-digits)

This number is a prime.

11111 1111111117 7777777777

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Seven 11's followed by eleven 7's is prime. Note that 7 and 11 are two consecutive primes. [De Geest]

Submitted: 2004-02-07 03:25:27; Last Modified: 2008-01-30 17:28:00.