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Index of 10^n within sequence of numbers of form 7^i*10^j.
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%I #5 Mar 30 2012 18:35:28

%S 1,3,6,10,15,21,29,38,48,59,71,85,100,116,133,151,170,191,213,236,260,

%T 285,312,340,369,399,430,462,496,531,567,604,642,682,723,765,808,852,

%U 897,944,992,1041,1091,1142,1195,1249,1304,1360,1417,1475,1535,1596,1658

%N Index of 10^n within sequence of numbers of form 7^i*10^j.

%K nonn

%O 1,2

%A _David W. Wilson_