1031

This number is a prime.

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The number of ones that form the fifth and largest known repunit prime. It was first proven prime in 1985. (The next few that could possibly be prime are those with 49081, 86453, 109297, and 270343 digits.)

Submitted: 1999-09-08 02:40:47; Last Modified: 2022-01-25 02:19:21.