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Index of 9^n within sequence of numbers of form 8^i*9^j.
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%I #5 Mar 30 2012 18:35:28

%S 1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,136,153,171,191,212,234,

%T 257,281,306,332,359,387,416,446,477,509,542,576,611,647,684,723,763,

%U 804,846,889,933,978,1024,1071,1119,1168,1218,1269,1321,1374,1428,1483,1540,1598

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

%K nonn

%O 1,2

%A _David W. Wilson_