A051823 Number of numbers below 10^n with nonzero multiplicative digital root 3.

1, 8, 48, 288, 1736, 10366, 63911, 435756, 3703209, 40131451, 482893994, 5700587521, 63022146850, 649554554509, 6315823743218, 59044525222412

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, A051814.

Sequence in context: A079745 A079758 A270576 * A037507 A037690 A180031

Adjacent sequences: A051820 A051821 A051822 * A051824 A051825 A051826

Keyword

nonn,base,hard

Author

Dan Hoey, Dec 09 1999

Status

approved