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 A227171 #18 Feb 02 2023 04:20:00 %S A227171 3,47,53,2411,4057,7963,10273,15737,53299 %N A227171 Numbers n such that (18^n + 17^n)/35 is prime. %C A227171 All terms are prime. %o A227171 (PARI) is(n)=ispseudoprime((18^n+17^n)/35) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A227171 Cf. A000978, A057469, A128066, A128335, A128336, A187805, A181141, A187819, A217095. %K A227171 hard,nonn,more %O A227171 1,1 %A A227171 _Jean-Louis Charton_, Jul 03 2013 %E A227171 a(7), a(8) from _Richard Fischer_, Aug 18 2013 %E A227171 a(9) from _Robert Price_, Aug 25 2013