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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

Table of n, a(n) for n=1..16.

FORMULA

# { i : 10^(n-1) < i < 10^n and A051802(i)=4 }

CROSSREFS

Cf. A051802, A051806, A051815.

Sequence in context: A022737 A016295 A225965 * A016285 A121086 A159969

Adjacent sequences:  A051821 A051822 A051823 * A051825 A051826 A051827

KEYWORD

nonn,base,hard

AUTHOR

Dan Hoey, Dec 09 1999

STATUS

approved

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Last modified June 5 09:46 EDT 2020. Contains 334829 sequences. (Running on oeis4.)