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 A021400 #19 Aug 13 2025 19:59:32
%S A021400 0,0,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,
%T A021400 2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,
%U A021400 2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2,5,2
%N A021400 Decimal expansion of 1/396.
%H A021400 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1).
%e A021400 0.0025252525252525252525252525252525252525252525252525...
%t A021400 First[RealDigits[1/396, 10, 100, -1]] (* or *)
%t A021400 PadRight[{0, 0}, 100, {2, 5}] (* _Paolo Xausa_, Aug 13 2025 *)
%Y A021400 A010695 shifted right.
%K A021400 nonn,cons,easy
%O A021400 0,3
%A A021400 _N. J. A. Sloane_