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 A021421 #11 Sep 05 2025 01:03:00 %S A021421 0,0,2,3,9,8,0,8,1,5,3,4,7,7,2,1,8,2,2,5,4,1,9,6,6,4,2,6,8,5,8,5,1,3, %T A021421 1,8,9,4,4,8,4,4,1,2,4,7,0,0,2,3,9,8,0,8,1,5,3,4,7,7,2,1,8,2,2,5,4,1, %U A021421 9,6,6,4,2,6,8,5,8,5,1,3,1,8,9,4,4,8,4,4,1,2,4,7,0,0,2,3,9,8,0 %N A021421 Decimal expansion of 1/417. %H A021421 <a href="/index/Rec#order_46">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1). %F A021421 From _Chai Wah Wu_, Sep 04 2025: (Start) %F A021421 a(n) = a(n-46) for n > 45. %F A021421 G.f.: x^2*(-7*x^43 - 4*x^42 - 2*x^41 - x^40 - 4*x^39 - 4*x^38 - 8*x^37 - 4*x^36 - 4*x^35 - 9*x^34 - 8*x^33 - x^32 - 3*x^31 - x^30 - 5*x^29 - 8*x^28 - 5*x^27 - 8*x^26 - 6*x^25 - 2*x^24 - 4*x^23 - 6*x^22 - 6*x^21 - 9*x^20 - x^19 - 4*x^18 - 5*x^17 - 2*x^16 - 2*x^15 - 8*x^14 - x^13 - 2*x^12 - 7*x^11 - 7*x^10 - 4*x^9 - 3*x^8 - 5*x^7 - x^6 - 8*x^5 - 8*x^3 - 9*x^2 - 3*x - 2)/(x^46 - 1). (End) %t A021421 realDigitsRecip[417] (* The realDigitsRecip program is at A021200 *) (* _Harvey P. Dale_, Jul 18 2025 *) %K A021421 nonn,cons,changed %O A021421 0,3 %A A021421 _N. J. A. Sloane_