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 A225955 #14 May 22 2021 16:11:53 %S A225955 2,5,11,167,317,337,349,3449,7517,23003 %N A225955 Numbers n such that (15^n - 2^n)/13 is prime. %C A225955 All terms are primes. %C A225955 a(11) > 2*10^5. %t A225955 Select[ Prime[ Range[1, 100000] ], PrimeQ[ (15^# - 2^#)/13 ]& ] %o A225955 (PARI) is(n)=ispseudoprime((15^n-2^n)/13) \\ _Charles R Greathouse IV_, May 22 2017 %Y A225955 Cf. A128028, A016054, A217320, A006033. %K A225955 more,nonn %O A225955 1,1 %A A225955 _Robert Price_, May 21 2013