A051828 - OEIS

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A051828

Number of numbers below 10^n with nonzero multiplicative digital root 8.

1, 24, 252, 2788, 31923, 352105, 3700992, 37619035, 375300388, 3721757919, 37050089673, 372206961122, 3774238125518, 38503409891419, 393429821383490, 4011462863576801

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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)=8 }

CROSSREFS

Cf. A051802, A051810, A051819.

Sequence in context: A278577 A022716 A181104 * A076847 A296575 A009175

Adjacent sequences: A051825 A051826 A051827 * A051829 A051830 A051831

KEYWORD

nonn,base,hard

AUTHOR

Dan Hoey, Dec 09 1999

STATUS

approved