34508...71551 (31-digits)

This number is a prime.

3 4508504860 8250393021 3321971551

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The first 31-digit Sophie Germain prime p to occur in the decimal expansion of π. Curiously, sod(p) is also Sophie Germain prime. [Bajpai]

Submitted: 2019-11-01 20:31:11; Last Modified: 2020-06-18 13:16:21.