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 A051211 #9 May 14 2017 03:00:38
%S A051211 0,3,7,8,15,16,19,24,27,35,40,48,55,63,72,80,88,91,99,112,115,120,135,
%T A051211 143,144,160,163,168,171,175,187,195,208,216,224,232,243,247,255,280,
%U A051211 288,295,315,319,323,328,352,360,391,399,403,427,432,440,448,475,483
%N A051211 Numbers of the form x^2-9^y >= 0.
%t A051211 max = 500; Clear[f]; f[m_] := f[m] = Select[Table[x^2 - 9^y, {y, 0, m}, {x, Floor[9^(y/2)], Ceiling[Sqrt[9^y + max]]}] // Flatten // Union, 0 <= # <= max &]; f[1]; f[m = 2]; While[f[m] != f[m - 1], m++]; Print["m = ", m]; A051211 = f[m] (* _Jean-François Alcover_, May 14 2017 *)
%K A051211 nonn
%O A051211 1,2
%A A051211 _David W. Wilson_