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 A021449 #17 Jul 08 2025 08:27:52
%S A021449 0,0,2,2,4,7,1,9,1,0,1,1,2,3,5,9,5,5,0,5,6,1,7,9,7,7,5,2,8,0,8,9,8,8,
%T A021449 7,6,4,0,4,4,9,4,3,8,2,0,2,2,4,7,1,9,1,0,1,1,2,3,5,9,5,5,0,5,6,1,7,9,
%U A021449 7,7,5,2,8,0,8,9,8,8,7,6,4,0,4,4,9,4,3,8,2,0,2,2,4,7,1,9,1,0,1
%N A021449 Decimal expansion of 1/445.
%C A021449 Expansion in any base b >= 3 of 2/(b(b-1)(b+1)) = 2/(b^3-b). E.g., 1/12 in base 3, 1/30 in base 4, 1/60 in base 5, etc. - _Franklin T. Adams-Watters_, Nov 07 2006
%H A021449 <a href="/index/Rec#order_23">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,-1,1).
%F A021449 From _Chai Wah Wu_, May 08 2025: (Start)
%F A021449 a(n) = a(n-1) - a(n-22) + a(n-23) for n > 23.
%F A021449 G.f.: x^2*(-2*x^21 - 6*x^20 + 5*x^19 - x^18 - 5*x^17 + 5*x^16 + 4*x^14 - 4*x^13 - 2*x^12 - x^11 - x^10 - x^8 + x^7 + 8*x^6 - 8*x^5 + 6*x^4 - 3*x^3 - 2*x^2 - 2)/(x^23 - x^22 + x - 1). (End)
%t A021449 Join[{0,0},RealDigits[1/445,10,120][[1]]] (* _Harvey P. Dale_, Aug 25 2015 *)
%o A021449 (PARI) 1/445. \\ _Charles R Greathouse IV_, Dec 05 2011
%Y A021449 Cf. A027480, A021093.
%K A021449 nonn,cons,easy
%O A021449 0,3
%A A021449 _N. J. A. Sloane_