A370659 Numbers k such that (4^k + 4*k)/4 is prime.
1, 3, 67, 247, 471, 1027, 6883, 11673
Offset: 1
Programs
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PARI
is(n) = ispseudoprime(4^(n-1)+n)
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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