A051826 Number of numbers below 10^n with nonzero multiplicative digital root 6.

1, 15, 213, 2337, 23231, 231651, 2349105, 23926057, 242539688, 2437578213, 24286001675, 240505616138, 2376317894981, 23497985025226, 232875555403623, 2312981893109766

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)=6 }

Crossrefs

Cf. A051802, A051808, A051817.

Sequence in context: A135519 A179091 A201340 * A351515 A081196 A020287

Adjacent sequences: A051823 A051824 A051825 * A051827 A051828 A051829

Keyword

nonn,base,hard

Author

Dan Hoey, Dec 09 1999

Status

approved