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A051826
Number of numbers below 10^n with nonzero multiplicative digital root 6.
1
1, 15, 213, 2337, 23231, 231651, 2349105, 23926057, 242539688, 2437578213, 24286001675, 240505616138, 2376317894981, 23497985025226, 232875555403623, 2312981893109766
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