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 A227170 #22 Feb 02 2023 04:19:45 %S A227170 3,5,13,1439,1669,37691 %N A227170 Numbers n such that (16^n + 15^n)/31 is prime. %C A227170 All terms are prime. %C A227170 a(7) > 10^5. - _Robert Price_, Aug 26 2013 %o A227170 (PARI) is(n)=ispseudoprime((16^n+15^n)/31) \\ _Charles R Greathouse IV_, May 22 2017 %Y A227170 Cf. A000978, A057469, A128066, A128335, A128336, A187805, A181141, A187819, A217095. %K A227170 hard,nonn,more %O A227170 1,1 %A A227170 _Jean-Louis Charton_, Jul 03 2013