11112222222222222222211

This number is a prime.

                                                   111 1222222222 2222222211

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R(23) + R(19) - R(2) is prime. Note that R(2), R(19), and R(23), are the first three repunit primes. [Wesolowski]

Submitted: 2008-01-08 14:33:19;   Last Modified: 2008-01-30 11:28:00.
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