77777...77777 (1000-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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7*(10^1000-1)/9-2*10^275 is the largest 1000-digit near-repdigit prime-digit prime. [Loungrides]

Submitted: 2016-03-31 05:10:50; Last Modified: 2018-04-13 10:57:05.