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 A190488 #8 Jul 03 2017 02:23:05
%S A190488 3,5,8,10,15,17,20,22,27,29,32,34,37,39,44,46,49,51,56,58,61,63,68,73,
%T A190488 75,78,80,85,87,90,92,97,99,102,104,107,109,114,116,119,121,126,128,
%U A190488 131,133,136,138,143,145,148,150,155,157,160,162,167,169,172,174,177,179,184,186,189,191,196,198,201,203,206,208,213,215,218
%N A190488 Positions of 0 in A190487.
%C A190488 See A190487.
%H A190488 G. C. Greubel, <a href="/A190488/b190488.txt">Table of n, a(n) for n = 1..1000</a>
%t A190488 r = Sqrt[2]; b = 3; c = 0;
%t A190488 f[n_] := Floor[(b*n + c)*r] - b*Floor[n*r] - Floor[c*r];
%t A190488 t = Table[f[n], {n, 1, 200}] (* A190487 *)
%t A190488 Flatten[Position[t, 0]] (* A190488 *)
%t A190488 Flatten[Position[t, 1]] (* A190489 *)
%t A190488 Flatten[Position[t, 2]] (* A190490 *)
%Y A190488 Cf. A190487.
%K A190488 nonn
%O A190488 1,1
%A A190488 _Clark Kimberling_, May 11 2011