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 A021199 #23 May 03 2024 14:21:26
%S A021199 0,0,5,1,2,8,2,0,5,1,2,8,2,0,5,1,2,8,2,0,5,1,2,8,2,0,5,1,2,8,2,0,5,1,
%T A021199 2,8,2,0,5,1,2,8,2,0,5,1,2,8,2,0,5,1,2,8,2,0,5,1,2,8,2,0,5,1,2,8,2,0,
%U A021199 5,1,2,8,2,0,5,1,2,8,2,0,5,1,2,8,2,0,5,1,2,8,2,0,5,1,2,8,2,0,5
%N A021199 Decimal expansion of 1/195.
%C A021199 Without the initial zeros, decimal expansion of 20/39. Period is of length 6: 5, 1, 2, 8, 2, 0. - _Alonso del Arte_, May 26 2018
%H A021199 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (1, -1, 1, -1, 1).
%e A021199 0.0051282051282051282051282051282051282...
%t A021199 Join[{0, 0}, RealDigits[1/195, 10, 104][[1]]] (* _Alonso del Arte_, May 13 2018 *)
%Y A021199 Cf. A021069 (1/65).
%K A021199 nonn,cons,easy
%O A021199 0,3
%A A021199 _N. J. A. Sloane_