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 A093621 #9 Nov 14 2019 17:50:40 %S A093621 1,1,1,1,2,2,4,2,2,4,3,1,5,2,3,4,2,3,5,19,10,3,5,4,5,7,5,1,6,21,2,9, %T A093621 15,15,13,10,27,1,4,37,14,1,4,2,34,5,8,18,24,2,13,5,11,35,48,11,7,48, %U A093621 27,21,30,5,43,7,4,46,13,24,16,60,12,34,5,1,38,14,28,1,10,24,50,5,3,42,40,28 %N A093621 Smallest k>0 such that n!/k!+1 is prime. %C A093621 The results were computed using the PrimeFormGW (PFGW) primality-testing program. - _Hugo Pfoertner_, Nov 14 2019 %F A093621 a(A002981(n)) = 1. %e A093621 a(39) =37 because 39!/k!+1 is composite for all k=1..36; 39!/37!+1=39*38+1=1483 is prime. %Y A093621 Cf. A093437 largest prime of the form n!/k!+1, A002981 n!+1 is prime, A093623 Smallest k>0 such that n!/k!-1 is prime. %K A093621 nonn %O A093621 0,5 %A A093621 _Hugo Pfoertner_, Apr 06 2004