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 A225818 #19 Jun 06 2017 14:35:01 %S A225818 5,223,311,54547 %N A225818 Numbers n such that (19^n + 18^n)/37 is prime. %C A225818 All terms are primes. %C A225818 a(5) > 10^5. - _Robert Price_, Oct 03 2013 %t A225818 Select[ Prime[ Range[1, 100000] ], PrimeQ[ (19^# + 18^#)/37 ]& ] %o A225818 (PARI) is(n)=ispseudoprime((19^n+18^n)/37) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A225818 Cf. A227170, A221637, A228558, A227046. %K A225818 hard,nonn,more %O A225818 1,1 %A A225818 _Robert Price_, Aug 26 2013