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 A339924 #13 Apr 08 2021 07:19:16
%S A339924 1,2,3,10,18,19,27,122,184,347,448,542,1685,5618,6208,9867,25522,
%T A339924 37688,47067,79195,114592,251797
%N A339924 Numbers k such that 14^k - 3 is prime.
%e A339924 1 is a term since 14^1 - 3 = 11 is a prime.
%t A339924 Do[ If[ PrimeQ[ 14^n - 3], Print[n]], {n, 0, 300000}]
%o A339924 (PARI) is(n)=isprime(14^n - 3)
%Y A339924 Cf. A339923.
%K A339924 nonn,more
%O A339924 1,2
%A A339924 _Paul Bourdelais_, Dec 23 2020