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A051824 Number of numbers below 10^n with nonzero multiplicative digital root 4. 1
1, 13, 118, 898, 6350, 46329, 382410, 3645765, 38163792, 410943130, 4368127170, 45097983418, 451960864264, 4431128837948, 42987600398290, 417247179973351 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
REFERENCES
William Mayne, sci.math, Jun 15 1991
LINKS
FORMULA
# { i : 10^(n-1) < i < 10^n and A051802(i)=4 }
CROSSREFS
Sequence in context: A022737 A016295 A225965 * A367244 A016285 A121086
KEYWORD
nonn,base,hard
AUTHOR
Dan Hoey, Dec 09 1999
STATUS
approved

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Last modified June 22 15:47 EDT 2024. Contains 373588 sequences. (Running on oeis4.)