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 A022001 #20 Jul 08 2025 09:13:51
%S A022001 0,0,1,0,0,3,0,0,9,0,2,7,0,8,1,2,4,3,7,3,1,1,9,3,5,8,0,7,4,2,2,2,6,6,
%T A022001 8,0,0,4,0,1,2,0,3,6,1,0,8,3,2,4,9,7,4,9,2,4,7,7,4,3,2,2,9,6,8,9,0,6,
%U A022001 7,2,0,1,6,0,4,8,1,4,4,4,3,3,2,9,9,8,9,9,6,9,9,0,9,7,2,9,1,8,7
%N A022001 Decimal expansion of 1/997.
%C A022001 Generalization:
%C A022001 1/7 = sum (3^i/10^(i+1)), i >= 0,
%C A022001 1/97 = sum (3^i/100^(i+1)), i >= 0,
%C A022001 1/997 = sum (3^i/1000^(i+1)), i >= 0, (this sequence)
%C A022001 1/9997 = sum (3^i/10000^(i+1)), i >= 0, ... - _Daniel Forgues_, Oct 28 2011
%C A022001 Periodic with period length 166. - _Ray Chandler_, Jan 09 2025
%H A022001 <a href="/index/Rec#order_84">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, 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).
%t A022001 Join[{0,0},RealDigits[1/997,10,120][[1]]] (* _Harvey P. Dale_, Jul 28 2023 *)
%o A022001 (PARI) 1/997. \\ _Charles R Greathouse IV_, Apr 02 2014
%K A022001 nonn,cons,easy
%O A022001 0,6
%A A022001 _N. J. A. Sloane_