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 A190889 #8 Jul 10 2020 03:51:16
%S A190889 2,6,11,15,19,23,32,36,40,49,53,57,61,66,70,74,78,83,87,91,95,104,108,
%T A190889 112,121,125,129,138,142,146,150,155,159,163,167,176,180,184,193,197,
%U A190889 201,210,214,218,222,227,231,235,239,248,252,256,265,269,273,282,286,290,294,299,303,307,311,316,320,324,328,337,341,345,354,358
%N A190889 Positions of 2 in A190886.
%C A190889 See A190886.
%t A190889 r = Sqrt[5];
%t A190889 f[n_] := Floor[5n*r] - 5*Floor[n*r]
%t A190889 t = Table[f[n], {n, 1, 400}] (* A190886 *)
%t A190889 Flatten[Position[t, 2]] (* A190889 *)
%Y A190889 Cf. A190886.
%K A190889 nonn
%O A190889 1,1
%A A190889 _Clark Kimberling_, May 26 2011