My question: what a formula for finding the number of numbers no greater than n that are divisible by all their suffixes.
e.g: 5, 25, 125, 0125, 70125 are divisors of 70125.
refinement: $\overline{0...0a_1a_2...} = \overline{a_1a_2...}$
2 of 3
The tag (divisors) is intended for divisors in algebraic geometry
Martin Sleziak
- 4.7k
- 4
- 35
- 40
The number of numbers no greater than n that are divisible by all their suffixes
Martin Leshko
- 61
- 4