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 A021108 #18 Oct 13 2022 14:18:17
%S A021108 0,0,9,6,1,5,3,8,4,6,1,5,3,8,4,6,1,5,3,8,4,6,1,5,3,8,4,6,1,5,3,8,4,6,
%T A021108 1,5,3,8,4,6,1,5,3,8,4,6,1,5,3,8,4,6,1,5,3,8,4,6,1,5,3,8,4,6,1,5,3,8,
%U A021108 4,6,1,5,3,8,4,6,1,5,3,8,4,6,1,5,3,8,4,6,1,5,3,8,4,6,1,5,3,8,4
%N A021108 Decimal expansion of 1/104.
%C A021108 After 9, periodic with period 6: [6, 1, 5, 3, 8, 4]. See also A021030 (1/26), A021069 (1/65), A021420 (1/416), A021654 (1/650). - _Bruno Berselli_, Apr 13 2018
%H A021108 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,-1,1).
%F A021108 Equals A020821 * A021017 = A020773 * A021030 = A020761 * A021056. - _Bruno Berselli_, Apr 13 2018
%e A021108 0.009615384615384615384615384615384615384615384615384615384615384...
%t A021108 Join[{0, 0}, RealDigits[1/104, 10, 120][[1]]] (* or *) PadRight[{0, 0, 9, 6}, 120,{3, 8, 4, 6, 1, 5}] (* _Harvey P. Dale_, Aug 18 2012 *)
%K A021108 nonn,cons,easy
%O A021108 0,3
%A A021108 _N. J. A. Sloane_