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A051828
Number of numbers below 10^n with nonzero multiplicative digital root 8.
1
1, 24, 252, 2788, 31923, 352105, 3700992, 37619035, 375300388, 3721757919, 37050089673, 372206961122, 3774238125518, 38503409891419, 393429821383490, 4011462863576801
OFFSET
1,2
REFERENCES
William Mayne, sci.math, Jun 15 1991
FORMULA
# { i : 10^(n-1) < i < 10^n and A051802(i)=8 }
CROSSREFS
KEYWORD
nonn,base,hard
AUTHOR
Dan Hoey, Dec 09 1999
STATUS
approved