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 A190679 #8 Mar 24 2013 13:29:54
%S A190679 1,4,8,12,15,16,19,23,27,30,31,34,38,42,45,46,49,53,56,57,60,64,68,71,
%T A190679 72,75,79,83,86,87,90,94,98,101,102,105,109,112,113,116,120,124,127,
%U A190679 128,131,135,139,142,143,146,150,154,157,161,165,168,169,172,176,180,183,184,187,191,195,198,199,202,206,209,210,213,217,221
%N A190679 Positions of 2 in A190676.
%C A190679 See A190676.
%t A190679 (See A190676.)
%t A190679 Flatten[Position[Table[Floor[3n Sqrt[3]]-3Floor[n Sqrt[3]],{n,240}],2]] (* _Harvey P. Dale_, Mar 24 2013 *)
%Y A190679 Cf. A190676.
%K A190679 nonn
%O A190679 1,2
%A A190679 _Clark Kimberling_, May 16 2011
%E A190679 Cross reference in name corrected by _Harvey P. Dale_, Mar 24 2013