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Index of 3^n within sequence of numbers of form 3^i*5^j.
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%I #4 Mar 30 2012 18:55:50

%S 1,2,4,7,10,14,19,24,30,37,44,52,61,70,80,91,102,114,127,140,154,169,

%T 185,201,218,236,254,273,293,313,334,356,378,401,425,449,474,500,526,

%U 553,581,609,638,668,699,730,762,795,828,862,897,932,968,1005,1042,1080,1119

%N Index of 3^n within sequence of numbers of form 3^i*5^j.

%K nonn

%O 1,2

%A _Clark Kimberling_