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%I #4 Jun 11 2014 17:24:22
%S 1,3,14,86,666,6418,64079,597445,5116146,40671872,304752986,
%T 2187716324,15395364971,110611591118,866239098731,7907500662596
%N Number of n-digit numbers with nonzero multiplicative digital root 7.
%D William Mayne, sci.math, Jun 15 1991
%F # { i : 10^(n-1) < i < 10^n and A051802(i)=7 }
%Y Cf. A051802, A051809, A051827.
%K nonn,base,hard
%O 1,2
%A _Dan Hoey_, Dec 09 1999
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