A051819 Number of n-digit numbers with nonzero multiplicative digital root 8.

1, 23, 228, 2536, 29135, 320182, 3348887, 33918043, 337681353, 3346457531, 33328331754, 335156871449, 3402031164396, 34729171765901, 354926411492071, 3618033042193311

Offset: 1

Author

Dan Hoey, Dec 09 1999

Keywords

• nonn
• base
• hard

References

• William Mayne, sci.math, Jun 15 1991

Crossrefs

Cf. A051802, A051810, A051828.

Formula

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