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 A227173 #16 Mar 19 2023 02:48:17 %S A227173 7,13,2371,2791,2999,4621,8819,21563 %N A227173 Numbers k such that (138^k + 137^k)/275 is prime. %C A227173 All terms are prime. %o A227173 (PARI) is(n)=ispseudoprime((138^n+137^n)/275) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A227173 Cf. A000978, A057469, A128066, A128335, A128336, A187805, A181141, A187819, A217095. %K A227173 hard,nonn,more %O A227173 1,1 %A A227173 _Jean-Louis Charton_, Jul 03 2013 %E A227173 a(8) from _Tyler Busby_, Mar 19 2023