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A051816 Number of n-digit numbers with nonzero multiplicative digital root 5. 1
1, 7, 58, 422, 2872, 19772, 142418, 1096582, 9040811, 78452199, 699839588, 6297456806, 56804155533, 517737762700, 4839960759976, 46837953974511 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
REFERENCES
William Mayne, sci.math, Jun 15 1991
LINKS
FORMULA
# { i : 10^(n-1) < i < 10^n and A051802(i)=5 }
CROSSREFS
Sequence in context: A219974 A266051 A202975 * A015566 A238810 A362210
KEYWORD
nonn,base,hard
AUTHOR
Dan Hoey, Dec 09 1999
STATUS
approved

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Last modified July 22 15:50 EDT 2024. Contains 374540 sequences. (Running on oeis4.)