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 A192125 #6 Oct 21 2019 14:41:37
%S A192125 0,2,6,8,9,36,68,84,92,96,98,99,488,744,872,936,968,984,992,996,998,
%T A192125 999,1808,5904,7952,8976,9488,9744,9872,9936,9968,9984,9992,9996,9998,
%U A192125 9999,34464,67232,83616,91808,95904,97952,98976,99488,99744,99872,99936
%N A192125 Monotonic ordering of nonnegative differences 10^i-2^j, for 40>= i>=0, j>=0.
%t A192125 c = 10; d = 2; t[i_, j_] := c^i - d^j;
%t A192125 u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];
%t A192125 v = Union[Flatten[u ]]
%Y A192125 Cf. A192124.
%K A192125 nonn
%O A192125 1,2
%A A192125 _Clark Kimberling_, Jun 23 2011