A051828 Number of numbers below 10^n with nonzero multiplicative digital root 8.

1, 24, 252, 2788, 31923, 352105, 3700992, 37619035, 375300388, 3721757919, 37050089673, 372206961122, 3774238125518, 38503409891419, 393429821383490, 4011462863576801

Offset: 1

Author

Dan Hoey, Dec 09 1999

Keywords

• nonn
• base
• hard

References

• William Mayne, sci.math, Jun 15 1991

Crossrefs

Cf. A051802, A051810, A051819.

Formula

# { i : 10^(n-1) < i < 10^n and A051802(i)=8 }