%I #5 Mar 30 2012 18:35:26
%S 1,2,4,7,11,16,22,29,37,46,56,67,79,92,106,121,136,152,169,187,206,
%T 226,247,269,292,316,341,367,394,422,451,481,511,542,574,607,641,676,
%U 712,749,787,826,866,907,949,992,1036,1080,1125,1171,1218,1266,1315,1365,1416
%N Index of 7^n within sequence of numbers of form 7^i*8^j.
%K nonn
%O 1,2
%A _David W. Wilson_