12312...31231 (100-digits)

This number is a prime.

1231231231 2312312312 3123123123
1231231231 2312312312 3123123123 1231231231 2312312312 3123123123 1231231231

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The largest prime less than a googol of the form 123123...231. [Loungrides]

Submitted: 2009-11-24 08:15:06; Last Modified: 2009-11-27 20:18:13.