57777...77777 (993-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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The largest non-titanic near-repdigit prime-digit prime p whose sum of digits (sod) is also prime. Curiously, p and sod(p) both can also be expressed as sum of two squares. [Bajpai]

Submitted: 2019-01-02 14:40:20; Last Modified: 2019-01-02 14:43:49.