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 A299799 #18 Apr 22 2024 08:09:33 %S A299799 443372888629441,582920080863121,39671149333495681,842526563598720001, %T A299799 2380296518909971201,3188618003602886401,33711266676317630401, %U A299799 54764632857801026161,122762671289519184001,361266866679292635601,4208895375600667752001,7673096805497432749441 %N A299799 Carmichael numbers (A002997) that are Chebyshev pseudoprimes (A175530). %C A299799 Odd composite integer n is in this sequence if n == 1 or p (mod (p^2-1)/2) for every prime p|n. %C A299799 No other terms below 10^22. %Y A299799 Intersection of A002997 and A175530. %Y A299799 Contains A175531 as a subsequence. %K A299799 nonn,hard,more %O A299799 1,1 %A A299799 _Max Alekseyev_, Feb 19 2018 %E A299799 a(9) from _Daniel Suteu_ confirmed and a(10) added by _Max Alekseyev_, Dec 16 2020 %E A299799 a(11)-a(12) from _Max Alekseyev_, Apr 21 2024