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 A366824 #6 Dec 05 2023 08:53:25 %S A366824 221799,300081,338884,3652374,8161701,10802625,13602835,18004375, %T A366824 80187723,133646205 %N A366824 Numbers k such that gcd(2^k + 1, k! - 1) has a prime divisor different from 2*k + 1. %C A366824 Possible prime divisors are listed in A366823. %C A366824 Different terms may correspond to the same prime. For example, both a(1) and a(2) produce prime A366823(1) = 521881. %Y A366824 Cf. A366823. %K A366824 nonn,hard,more %O A366824 1,1 %A A366824 Rustem Aidagulov and _Max Alekseyev_, Oct 24 2023