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 A192166 #6 Oct 21 2019 14:59:51
%S A192166 0,3,6,33,45,48,87,279,327,339,342,423,1377,2145,2337,2385,2397,2400,
%T A192166 12711,15783,16551,16743,16791,16803,16806,52113,101265,113553,116625,
%U A192166 117393,117585,117633,117645,117648,561399,758007,807159,819447,822519,823287
%N A192166 Monotonic ordering of nonnegative differences 7^i-4^j, for 40>=i>=0, j>=0.
%t A192166 c = 7; d = 4; t[i_, j_] := c^i - d^j;
%t A192166 u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];
%t A192166 v = Union[Flatten[u ]]
%Y A192166 Cf. A192165.
%K A192166 nonn
%O A192166 1,2
%A A192166 _Clark Kimberling_, Jun 24 2011