12345...56781 (72-digits)

This number is a prime.

12
3456790123 4567901234 5679012345 6790123456 7901234567 9012345679 0123456781

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R(2)+R(3)+R(4)+ … +R(72) is prime, where R(n) is a repunit number. [Rivera]

Submitted: 2019-04-17 10:49:43; Last Modified: 2019-04-17 11:31:55.