12312...31231 (100-digits)

This number is a prime.

                                            1231231231 2312312312 3123123123
1231231231 2312312312 3123123123 1231231231 2312312312 3123123123 1231231231

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

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell