A051825 Number of numbers below 10^n with nonzero multiplicative digital root 5.

1, 8, 66, 488, 3360, 23132, 165550, 1262132, 10302943, 88755142, 788594730, 7086051536, 63890207069, 581627969769, 5421588729745, 52259542704256

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)=5 }

Crossrefs

Cf. A051802, A051807, A051816.

Sequence in context: A121781 A121780 A121779 * A218927 A303485 A121778

Adjacent sequences: A051822 A051823 A051824 * A051826 A051827 A051828

Keyword

nonn,base,hard

Author

Dan Hoey, Dec 09 1999

Status

approved