%I #6 Oct 21 2019 14:49:59

%S 0,2,8,20,26,32,74,80,194,236,242,386,680,722,728,1844,2138,2180,2186,

%T 2876,4160,6218,6512,6554,6560,17282,19340,19634,19676,19682,42242,

%U 56648,58706,59000,59042,59048,59498,160340,174746,176804,177098,177140,177146

%N Monotonic ordering of nonnegative differences 3^i-7^j, for 40>= i>=0, j>=0.

%t c = 3; d = 7; t[i_, j_] := c^i - d^j;

%t u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];

%t v = Union[Flatten[u ]]

%Y Cf. A192154.

%K nonn

%O 1,2

%A _Clark Kimberling_, Jun 24 2011