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 A338525 #18 Sep 08 2022 08:46:25 %S A338525 5,7,107,383,17359,21929,26393 %N A338525 Numbers k such that (11^k + 6^k)/17 is prime. %C A338525 All terms are prime. %C A338525 The corresponding primes are 9931, 1162771, ... %H A338525 Wikipedia, <a href="https://en.wikipedia.org/wiki/Mersenne_prime">Mersenne prime</a> %t A338525 Select[Range[1, 10000], PrimeQ[(11^# + 6^#)/17] &] %o A338525 (PARI) for(n=1, 10000, if(isprime((11^n + 6^n)/17), print1(n, ", "))) %o A338525 (Magma) [n: n in [1..10000] |IsPrime((11^n + 6^n)/17)] %Y A338525 Cf. A057177, A125957, A128070, A224501, A128340. %K A338525 nonn,more,hard %O A338525 1,1 %A A338525 _Tim Johannes Ohrtmann_, Nov 01 2020