12345...23407 (438-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

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R(2)+R(3)+R(4)+ … +R(438) is prime, where R(n) is a repunit number. [Rivera]

Submitted: 2019-04-16 12:21:39; Last Modified: 2019-04-16 12:29:40.