31111...11111 (89-digits)
This number is a prime.
311111111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111
Term 89 in the almost repunit sequence 3, 31, 311, 3111, 31111, etc., constitutes the largest prime output within the initial one hundred terms. [Schiffman]
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