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A051814 Number of n-digit numbers with nonzero multiplicative digital root 3. 1
1, 7, 40, 240, 1448, 8630, 53545, 371845, 3267453, 36428242, 442762543, 5217693527, 57321559329, 586532407659, 5666269188709, 52728701479194 (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)=3 }

CROSSREFS

Cf. A051802, A051805, A051823.

Sequence in context: A026782 A099459 A243875 * A154968 A121582 A239989

Adjacent sequences:  A051811 A051812 A051813 * A051815 A051816 A051817

KEYWORD

nonn,base,hard

AUTHOR

Dan Hoey, Dec 09 1999

STATUS

approved

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Last modified September 15 14:32 EDT 2019. Contains 327078 sequences. (Running on oeis4.)