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A051816 Number of n-digit numbers with nonzero multiplicative digital root 5. 1
1, 7, 58, 422, 2872, 19772, 142418, 1096582, 9040811, 78452199, 699839588, 6297456806, 56804155533, 517737762700, 4839960759976, 46837953974511 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

REFERENCES

William Mayne, sci.math, Jun 15 1991

FORMULA

# { i : 10^(n-1) < i < 10^n and A051802(i)=5 }

CROSSREFS

Cf. A051802, A051807, A051825.

Sequence in context: A122649 A051846 A202975 * A015566 A006193 A139397

Adjacent sequences:  A051813 A051814 A051815 * A051817 A051818 A051819

KEYWORD

nonn,base,hard

AUTHOR

Dan Hoey (Hoey(AT)AIC.NRL.Navy.Mil), Dec 09 1999

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Last modified February 14 09:18 EST 2012. Contains 205614 sequences.