A370664 Numbers k such that A176972(k) = 7^k + 7*k + 1 is prime.
0, 5, 11, 1389, 5351, 6207, 31173
Offset: 1
Programs
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PARI
is(n) = ispseudoprime(7^n+7*n+1)
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.
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