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

Author

Dan Hoey, Dec 09 1999

Keywords

• nonn
• base
• hard

References

• William Mayne, sci.math, Jun 15 1991

Crossrefs

Cf. A051802, A051808, A051817.

Formula

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