A108468 Numbers k such that (1/9)*(-1 + 10^k) + k is prime.
1, 2, 8, 10, 20, 590, 1058
Offset: 1
Crossrefs
Cf. A110369.
Programs
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PARI
is(n)=ispseudoprime((10^n-1)/9+n) \\ Charles R Greathouse IV, Jun 13 2017
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.
is(n)=ispseudoprime((10^n-1)/9+n) \\ Charles R Greathouse IV, Jun 13 2017
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