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 A021549 #14 Aug 03 2025 12:14:14
%S A021549 0,0,1,8,3,4,8,6,2,3,8,5,3,2,1,1,0,0,9,1,7,4,3,1,1,9,2,6,6,0,5,5,0,4,
%T A021549 5,8,7,1,5,5,9,6,3,3,0,2,7,5,2,2,9,3,5,7,7,9,8,1,6,5,1,3,7,6,1,4,6,7,
%U A021549 8,8,9,9,0,8,2,5,6,8,8,0,7,3,3,9,4,4,9,5,4,1,2,8,4,4,0,3,6,6,9,7,2,4,7,7,0,6,4,2,2,0
%N A021549 Decimal expansion of 1/545.
%H A021549 <a href="/index/Rec#order_55">Index entries for linear recurrences with constant coefficients</a>, signature (1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1).
%F A021549 Equals A021113/5.
%e A021549 0.00183486238532110091743119266055045871559633... .
%t A021549 Join[{0,0},RealDigits[1/545,10,120][[1]]] (* _Harvey P. Dale_, Jan 30 2019 *)
%Y A021549 Cf. A021113.
%K A021549 nonn,cons,easy
%O A021549 0,4
%A A021549 _N. J. A. Sloane_