33333331

This number is a prime.

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The last of the sequence 31, 331, 3331, 33331, 333331, 3333331, 33333331 that are all primes. The next prime of this form has 18 digits. [Ludovicus]

Submitted: 2009-03-01 11:37:21; Last Modified: 2010-08-12 17:36:31.