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 A021059 #28 Jun 09 2025 09:02:37
%S A021059 0,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,
%T A021059 8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,
%U A021059 8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8,1,8
%N A021059 Decimal expansion of 1/55.
%H A021059 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1).
%F A021059 Multiplicative with a(2^e) = 8, a(p^e) = 1 otherwise. - _David W. Wilson_, Jun 12 2005
%F A021059 Dirichlet g.f.: zeta(s) * (1 + 7/2^s). - _Amiram Eldar_, Jun 09 2025
%e A021059 0.0181818181818181818181818...
%t A021059 RealDigits[1/55, 10, 100, -1][[1]] (* _Amiram Eldar_, Jun 09 2025 *)
%o A021059 (PARI) { default(realprecision); x=1/55*10; for(n=1, 100, d=floor(x); x=(x-d)*10; print1(d, ", ")) } \\ _Felix Fröhlich_, Aug 11 2014
%Y A021059 A010689 shifted right.
%K A021059 nonn,cons,mult,easy
%O A021059 0,3
%A A021059 _N. J. A. Sloane_