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 A192152 #6 Oct 21 2019 14:49:28
%S A192152 0,3,5,9,27,33,35,135,189,207,213,215,567,1053,1215,1269,1287,1293,
%T A192152 1295,5589,7047,7533,7695,7749,7767,7773,7775,26973,40095,44469,45927,
%U A192152 46413,46575,46629,46647,46653,46655,85293,102789,220887,260253,273375,277749
%N A192152 Monotonic ordering of nonnegative differences 6^i-3^j, for 40>= i>=0, j>=0.
%t A192152 c = 6; d = 3; t[i_, j_] := c^i - d^j;
%t A192152 u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];
%t A192152 v = Union[Flatten[u ]]
%Y A192152 Cf. A192151.
%K A192152 nonn
%O A192152 1,2
%A A192152 _Clark Kimberling_, Jun 24 2011