11111...11111 (3089-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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A palindromic prime of the form (10^(2*1544+1)+27*10^1544-1)/9. Dedicated to Michael Stifel who published Arithmetica integra in 1544.

Submitted: 2021-01-01 19:14:12; Last Modified: 2021-01-01 19:27:42.