11111...11113 (84-digits)

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                                                             1111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111113

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The largest prime among the initial one hundred terms in the almost repunit sequence 3, 13, 113, 1113, 11113, etc. The closed form for this sequence is (10 ^ n + 17) / 9, and can also be defined recursively as follows: Define u (1) = 3 and u (n) = 10 * u(n - 1) - 17 for n > 1. [Schiffman]