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 A192163 #6 Oct 21 2019 14:56:34
%S A192163 0,3,10,15,28,40,58,63,220,250,255,808,988,1018,1023,2800,3880,4060,
%T A192163 4090,4095,8608,15088,16168,16348,16378,16383,18880,57760,64240,65320,
%U A192163 65500,65530,65535,215488,254368,260848,261928,262108,262138,262143,768640,1001920
%N A192163 Monotonic ordering of nonnegative differences 4^i-6^j, for 40>= i>=0, j>=0.
%t A192163 c = 4; d = 6; t[i_, j_] := c^i - d^j;
%t A192163 u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];
%t A192163 v = Union[Flatten[u ]]
%Y A192163 Cf. A192164.
%K A192163 nonn
%O A192163 1,2
%A A192163 _Clark Kimberling_, Jun 24 2011