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.
%I A217354 #17 Feb 17 2017 17:06:22 %S A217354 1,2,4,5,6,10,28,76,130,370,568,713,789,790,1334,1354,1849,2913,5729, %T A217354 5740,5978,6908,10618,11918,12748,13449,40850,68654,78442,121040, %U A217354 159948,228526 %N A217354 Numbers n such that 8^n + 3 is prime. %C A217354 3*A217354 is a subsequence of A057732. - _Bruno Berselli_, Oct 02 2012 %t A217354 Select[Range[5000], PrimeQ[8^# + 3] &] %o A217354 (PARI) is(n)=ispseudoprime(8^n+3) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A217354 Cf. A057732, A089437, A217353. %K A217354 nonn %O A217354 1,2 %A A217354 _Vincenzo Librandi_, Oct 02 2012 %E A217354 a(19)-a(32) are obtained from A057732; by _Bruno Berselli_, Oct 02 2012