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Index of 9^n within sequence of numbers of form 2^i*9^j.
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%I #5 Mar 30 2012 18:35:28

%S 1,5,12,22,35,51,71,94,120,149,181,216,255,297,342,390,441,495,553,

%T 614,678,745,815,888,965,1045,1128,1214,1303,1395,1491,1590,1692,1797,

%U 1905,2016,2131,2249,2370,2494,2621,2751,2885,3022,3162,3305,3451,3600,3753

%N Index of 9^n within sequence of numbers of form 2^i*9^j.

%K nonn

%O 1,2

%A _David W. Wilson_