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 A213176 #9 Jun 06 2017 14:29:43 %S A213176 7,11,31,59,73,137,563,34819,48751,73849 %N A213176 Numbers n such that (13^n + 4^n)/17 is prime. %C A213176 All terms are prime. %C A213176 a(11) > 10^5. %t A213176 Select[ Prime[ Range[1, 100000] ], PrimeQ[ (13^# + 4^#)/17 ]& ] %o A213176 (PARI) is(n)=ispseudoprime((13^n+4^n)/17) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A213176 Cf. A057179, A128071, A128342, A224501, A225097. %K A213176 hard,nonn,more %O A213176 1,1 %A A213176 _Robert Price_, May 03 2013