12345...23451 (42-digits)

This number is a prime.

12 3456790123 4567901234 5679012345 6790123451

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R(2)+R(3)+R(4)+ ... +R(42) is a 42-digit prime, where R(n) is a repunit number. [Rivera]

Submitted: 2019-04-03 17:53:43; Last Modified: 2019-04-07 20:51:12.