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 A094922 #8 Feb 18 2023 08:08:15 %S A094922 0,0,0,0,1,0,1,0,0,8,1,0,1,8,12,0,1,0,1,0,15,8,1,0,1,8,0,8,1,18,1,0, %T A094922 24,8,22,0,1,8,18,0,1,36,1,4,36,8,1,0,8,8,6,36,1,0,7,8,0,8,1,0,1,8,36, %U A094922 0,6,6,1,60,57,8,1,0,1,8,57,20,43,30,1,0,0,8,1,36,81,8,57,16,1,18,29,32,57 %N A094922 a(n) = (7^n-1)/6 mod n. %H A094922 Antti Karttunen, <a href="/A094922/b094922.txt">Table of n, a(n) for n = 1..20000</a> %o A094922 (PARI) A094922(n) = ((((7^n)-1)/6)%n); \\ _Antti Karttunen_, Feb 18 2023 %K A094922 nonn,look %O A094922 1,10 %A A094922 _N. J. A. Sloane_, Jun 18 2004