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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A004023 Indices of prime repunits: numbers k such that 11...111 (with k 1's) = (10^k - 1)/9 is prime.

Table of values

n a(n)
1 2
2 19
3 23
4 317
5 1031
6 49081
7 86453
8 109297
9 270343
10 5794777
11 8177207

List of values

[2, 19, 23, 317, 1031, 49081, 86453, 109297, 270343, 5794777, 8177207]