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 A021895 #26 Jul 31 2024 01:37:33
%S A021895 0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,9,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,
%T A021895 8,9,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,9,0,0,1,1,2,2,3,3,4,4,5,5,6,6,
%U A021895 7,7,8,9,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,9,0,0,1,1,2,2,3,3,4
%N A021895 Decimal expansion of 1/891.
%C A021895 Sqrt(161616161616161616161616161616161616) = 12*sqrt(1122334455667789001122334455667789). - _Ryohei Miyadera_, Yosuke Ikeda, Yasushi Kondo, and Yasuhiko Sakaitani, Jan 16 2006
%D A021895 Albert H. Beiler, Recreations in the theory of numbers, New York, Dover, (2nd ed.) 1966. See p. 59.
%H A021895 <a href="/index/Rec#order_18">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1).
%F A021895 G.f.: x^2*(Sum_{i=0..17} floor((i+2)/2)*x^i + x^15 - 9*x^16*(1 + x))/(1 - x^18). - _Stefano Spezia_, Jul 30 2024
%t A021895 Join[{0,0},RealDigits[1/891,10,120][[1]]] (* _Harvey P. Dale_, Sep 26 2020 *)
%o A021895 (PARI) 1/891. \\ _Charles R Greathouse IV_, Apr 25 2016
%Y A021895 Cf. A004526.
%K A021895 nonn,cons,easy
%O A021895 0,5
%A A021895 _N. J. A. Sloane_