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A051819
Number of n-digit numbers with nonzero multiplicative digital root 8.
1
1, 23, 228, 2536, 29135, 320182, 3348887, 33918043, 337681353, 3346457531, 33328331754, 335156871449, 3402031164396, 34729171765901, 354926411492071, 3618033042193311
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