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 A109866 #10 Jun 25 2018 12:17:02
%S A109866 8,3,8,1,9,6,6,0,1,1,2,5,0,1,0,5,1,5,1,7,9,5,4,1,3,1,6,5,6,3,4,3,6,1,
%T A109866 8,8,2,2,7,9,6,9,0,8,2,0,1,9,4,2,3,7,1,3,7,8,6,4,5,5,1,3,7,7,2,9,4,7,
%U A109866 3,9,5,3,7,1,8,1,0,9,7,5,5,0,2,9,2,7,9,2,7,9,5,8,1,0,6,0,8,8,6,2,5,1,5,2,4,5,9,1,1,9,2,4,6,1
%N A109866 9's complement of the digits of the golden ratio phi (A001622): 9.999999999999... - 1.6180339887... = 8.3819660112501051517954131656334...
%H A109866 Harvey P. Dale, <a href="/A109866/b109866.txt">Table of n, a(n) for n = 1..1000</a>
%t A109866 With[{nn=120},PadRight[{},nn,9]-RealDigits[GoldenRatio,10,nn][[1]]] (* _Harvey P. Dale_, Jun 25 2018 *)
%Y A109866 Cf. A079585, A094874, A132338.
%K A109866 base,easy,nonn
%O A109866 1,1
%A A109866 _Amarnath Murthy_, Jul 09 2005