%I #5 Mar 30 2012 18:35:28
%S 1,2,4,7,11,16,22,29,37,45,54,64,75,87,100,114,129,145,161,178,196,
%T 215,235,256,278,301,325,349,374,400,427,455,484,514,545,576,608,641,
%U 675,710,746,783,821,860,899,939,980,1022,1065,1109,1154,1200,1247,1294,1342
%N Index of 7^n within sequence of numbers of form 7^i*9^j.
%K nonn
%O 1,2
%A _David W. Wilson_