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 A190435 #7 Apr 06 2018 22:25:12
%S A190435 3,8,11,16,21,24,29,37,42,45,50,55,58,63,71,76,79,84,92,97,100,105,
%T A190435 110,113,118,126,131,134,139,144,147,152,155,160,165,168,173,181,186,
%U A190435 189,194,199,202,207,215,220,223,228,236,241,244,249,254,257,262,270,275,278,283,288,291,296,304,309,312,317,325,330,333,338,343
%N A190435 Positions of 3 in A190431.
%C A190435 See A190431.
%H A190435 G. C. Greubel, <a href="/A190435/b190435.txt">Table of n, a(n) for n = 1..10000</a>
%t A190435 r = GoldenRatio; b = 3; c = 1;
%t A190435 f[n_] := Floor[(b*n + c)*r] - b*Floor[n*r] - Floor[c*r];
%t A190435 t = Table[f[n], {n, 1, 320}] (* A190431 *)
%t A190435 Flatten[Position[t, 0]] (* A190432 *)
%t A190435 Flatten[Position[t, 1]] (* A190433 *)
%t A190435 Flatten[Position[t, 2]] (* A190434 *)
%t A190435 Flatten[Position[t, 3]] (* A190435 *)
%Y A190435 Cf. A190431.
%K A190435 nonn
%O A190435 1,1
%A A190435 _Clark Kimberling_, May 10 2011