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 A021325 #34 Aug 11 2025 16:03:33
%S A021325 0,0,3,1,1,5,2,6,4,7,9,7,5,0,7,7,8,8,1,6,1,9,9,3,7,6,9,4,7,0,4,0,4,9,
%T A021325 8,4,4,2,3,6,7,6,0,1,2,4,6,1,0,5,9,1,9,0,0,3,1,1,5,2,6,4,7,9,7,5,0,7,
%U A021325 7,8,8,1,6,1,9,9,3,7,6,9,4,7,0,4,0,4,9,8,4,4,2,3,6,7,6,0,1,2,4
%N A021325 Decimal expansion of 1/321.
%C A021325 Periodic with period 53, the order of 10 modulo 321. - _Joerg Arndt_, Aug 16 2022
%H A021325 Anubhav Dhar, <a href="/A021325/b021325.txt">Table of n, a(n) for n = 0..200</a>
%H A021325 <a href="/index/Rec#order_53">Index entries for linear recurrences with constant coefficients</a>, signature (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).
%e A021325 0.003115264797507788161993769470404984423676012461059...
%t A021325 Join[{0,0},RealDigits[1/321,10,120][[1]]] (* _Harvey P. Dale_, Apr 26 2011 *)
%t A021325 realDigitsRecip[321] (* The realDigitsRecip program is at A021200 *) (* _Harvey P. Dale_, Jan 30 2025 *)
%K A021325 nonn,cons,easy
%O A021325 0,3
%A A021325 _N. J. A. Sloane_