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 A181185 #11 Mar 10 2024 18:20:11 %S A181185 1,2,3,6,17,25,40,45,143,289,510,524,526,716,756,1008,1271,1370,3677, %T A181185 7963,9053 %N A181185 Numbers k such that (2^k - 1) * k! + 1 is prime. %C A181185 The original motivation for this sequence was in an article by J. Earls, Horace S. Uhler and Some Numbers in His Honor, the author of which no longer wishes to make public. - _N. J. A. Sloane_, Apr 04 2016 %o A181185 (PARI) is(n)=ispesudoprime((2^n-1)*n!+1) \\ _Charles R Greathouse IV_, Jun 13 2017 %K A181185 more,nonn %O A181185 1,2 %A A181185 _Jason Earls_, Oct 09 2010 %E A181185 a(20)-a(21) from _Tyler Busby_, Mar 10 2024