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A051812 Number of n-digit numbers with nonzero multiplicative digital root 1. 1
1, 5, 24, 243, 3048, 35224, 374890, 3766188, 36537927, 348892847, 3315037530, 31399344551, 295789894509, 2769886220702, 25882768895688, 243033400452156 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Not counting zero as a one-digit number

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)=1 }

CROSSREFS

Cf. A051802, A051803, A051821.

Sequence in context: A120765 A259355 A297664 * A267279 A257214 A003224

Adjacent sequences:  A051809 A051810 A051811 * A051813 A051814 A051815

KEYWORD

nonn,base,hard

AUTHOR

Dan Hoey, Dec 09 1999

STATUS

approved

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Last modified November 20 20:44 EST 2019. Contains 329347 sequences. (Running on oeis4.)