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 A192122 #6 Oct 21 2019 14:39:41
%S A192122 0,1,3,7,15,23,31,47,55,63,119,127,175,247,255,295,431,503,511,943,
%T A192122 1015,1023,1319,1631,1967,2039,2047,3367,4015,4087,4095,6487,7463,
%U A192122 8111,8183,8191,9823,15655,16303,16375,16383,26207,32039,32687,32759,32767,58975
%N A192122 Monotonic ordering of nonnegative differences 2^i-9^j, for 40>=i>=0, j>=0.
%t A192122 c = 2; d = 9; t[i_, j_] := c^i - d^j;
%t A192122 u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];
%t A192122 v = Union[Flatten[u ]]
%Y A192122 Cf. A192123.
%K A192122 nonn
%O A192122 1,3
%A A192122 _Clark Kimberling_, Jun 23 2011