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 A094923 #9 Nov 21 2013 12:48:19
%S A094923 0,1,1,1,1,3,0,1,1,9,1,9,1,7,13,9,1,9,1,5,7,9,1,9,6,9,19,21,1,9,1,9,7,
%T A094923 9,28,9,1,9,34,25,1,21,1,13,1,9,1,9,0,39,22,13,1,27,28,49,16,9,1,45,1,
%U A094923 9,28,9,1,27,1,41,4,49,1,9,1,9,58,53,63,9,1,25,46,9,1,21,6,9,73,65,1,9,21,33
%N A094923 (8^n-1)/7 mod n.
%H A094923 Vincenzo Librandi, <a href="/A094923/b094923.txt">Table of n, a(n) for n = 1..1000</a>
%t A094923 Table[Mod[(8^n-1)/7,n],{n,100}] (* _Harvey P. Dale_, Jul 30 2011 *)
%K A094923 nonn
%O A094923 1,6
%A A094923 _N. J. A. Sloane_, Jun 18 2004