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 A216591 #20 Jul 12 2018 11:33:43 %S A216591 10,38,428,824,3902,4712,5596,29572 %N A216591 Numbers k such that 8^k + k^8 - 1 is prime. %C A216591 a(9) > 10^5. _Robert Price_, Feb 25 2014 %t A216591 Select[Range[0, 4000],PrimeQ[8^# + #^8 - 1] &] %o A216591 (PARI) is(n)=ispseudoprime(8^n+n^8-1) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A216591 Cf. A100357, A215434-A215446, A216375. %K A216591 nonn,hard,more %O A216591 1,1 %A A216591 _Vincenzo Librandi_, Sep 09 2012 %E A216591 a(6)-a(8) from _Robert Price_, Feb 25 2014