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 A366823 #8 Dec 05 2023 08:53:12 %S A366823 521881,774593,4327489,21764537,28807001,213833929 %N A366823 Primes p that divide gcd(2^k + 1, k! - 1) for some k other than (p-1)/2. %C A366823 Prime p divides gcd(2^k + 1, k! - 1) for k = (p-1)/2 iff p belongs to A058302 and p == 3 (mod 8). %Y A366823 Cf. A058302, A366824 (possible values of k). %K A366823 nonn,more,hard %O A366823 1,1 %A A366823 Rustem Aidagulov and _Max Alekseyev_, Oct 24 2023