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A051817
Number of n-digit numbers with nonzero multiplicative digital root 6.
1
1, 14, 198, 2124, 20894, 208420, 2117454, 21576952, 218613631, 2195038525, 21848423462, 216219614463, 2135812278843, 21121667130245, 209377570378397, 2080106337706143
OFFSET
1,2
REFERENCES
William Mayne, sci.math, Jun 15 1991
FORMULA
# { i : 10^(n-1) < i < 10^n and A051802(i)=6 }
CROSSREFS
KEYWORD
nonn,base,hard
AUTHOR
Dan Hoey, Dec 09 1999
STATUS
approved