77777...31313 (27-digits)

This number is a prime.

7777777 7777771313 1313131313

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Thirteen 7's followed by seven 13's is prime. "Lucky 7" and "Unlucky 13" keeping each other in perfect balance. [De Geest]

Submitted: 2004-02-08 13:51:40; Last Modified: 2008-12-19 04:10:29.