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 A333341 #7 Apr 15 2020 00:13:04 %S A333341 1,1,4,1,5,5,16,5,4,5,9,5,5,17,5,5,11,11,16,5,16,9,2,5,25,5,4,17,74,5, %T A333341 56,21,16,11,100,29,13,101,5,5,43,17,27,9,40,61,8,5,32,25,11,5,28,29, %U A333341 45,61,16,149,21,5,3,63,58,53,5,47,75,133,4,145,76,29 %N A333341 a(n) is the smallest positive number k such that n divides 5^k - k. %C A333341 For any positive integer n, if k = a(n) + n*m*A007736(n) and m >= 0 then 5^k - k is divisible by n. %F A333341 a(5^m) = 5^m for m >= 0. %o A333341 (PARI) a(n) = for(k=1, oo, if(Mod(5, n)^k==k, return(k))); %Y A333341 Cf. A007736, A072872, A333336, A333339, A333340. %K A333341 nonn %O A333341 1,3 %A A333341 _Jinyuan Wang_, Apr 14 2020