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Index of 8^n within sequence of numbers of form 8^i*9^j.
1

%I #14 Feb 13 2023 14:06:19

%S 1,2,4,7,11,16,22,29,37,46,56,67,79,92,106,121,137,154,172,190,209,

%T 229,250,272,295,319,344,370,397,425,454,484,515,547,580,614,649,685,

%U 721,758,796,835,875,916,958,1001,1045,1090,1136,1183,1231,1280,1330,1381,1433

%N Index of 8^n within sequence of numbers of form 8^i*9^j.

%Y Cf. A001018, A025633.

%K nonn

%O 1,2

%A _David W. Wilson_