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 A192123 #6 Oct 21 2019 14:40:16
%S A192123 0,1,5,7,8,17,49,65,73,77,79,80,217,473,601,665,697,713,721,725,727,
%T A192123 728,2465,4513,5537,6049,6305,6433,6497,6529,6545,6553,6557,6559,6560,
%U A192123 7153,26281,42665,50857,54953,57001,58025,58537,58793,58921,58985,59017
%N A192123 Monotonic ordering of nonnegative differences 9^i-2^j, for 40>= i>=0, j>=0.
%t A192123 c = 9; d = 2; t[i_, j_] := c^i - d^j;
%t A192123 u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];
%t A192123 v = Union[Flatten[u ]]
%Y A192123 Cf. A192122.
%K A192123 nonn
%O A192123 1,3
%A A192123 _Clark Kimberling_, Jun 23 2011