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 A217320 #11 Jun 06 2017 14:32:59 %S A217320 3,5,31,73,89,521,3943,8719 %N A217320 Numbers n such that (13^n - 2^n)/11 is prime. %C A217320 All terms are primes. %C A217320 a(9) > 10^5. %t A217320 Select[ Prime[ Range[1, 100000] ], PrimeQ[ (13^# - 2^#)/11 ]& ] %o A217320 (PARI) is(n)=ispseudoprime((13^n-2^n)/11) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A217320 Cf. A128028, A016054, A210506. %K A217320 hard,more,nonn %O A217320 1,1 %A A217320 _Robert Price_, Mar 18 2013