A051817 Number of n-digit numbers with nonzero multiplicative digital root 6.

1, 14, 198, 2124, 20894, 208420, 2117454, 21576952, 218613631, 2195038525, 21848423462, 216219614463, 2135812278843, 21121667130245, 209377570378397, 2080106337706143

Offset: 1

Author

Dan Hoey, Dec 09 1999

Keywords

• nonn
• base
• hard

References

• William Mayne, sci.math, Jun 15 1991

Crossrefs

Cf. A051802, A051808, A051826.

Formula

# { i : 10^(n-1) < i < 10^n and A051802(i)=6 }