A051829 Number of numbers below 10^n with nonzero multiplicative digital root 9.

1, 5, 30, 210, 1850, 19528, 233289, 2805652, 31522803, 326897695, 3190607915, 30250443755, 287335303424, 2785929699350, 27611310448037, 276727430606458

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)=9 }

Crossrefs

Cf. A051802, A051811, A051820.

Sequence in context: A365178 A001720 A361545 * A323770 A260351 A058247

Adjacent sequences: A051826 A051827 A051828 * A051830 A051831 A051832

Keyword

nonn,base,hard

Author

Dan Hoey, Dec 09 1999

Status

approved