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: $\overline{0...0a_1a_2...} = \overline{a_1a_2...}$
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added the (digits) tag - this is the closest tag to the topic "number written in decimal form" I was able to find
Martin Sleziak
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The number of numbers no greater than n that are divisible by all their suffixes
Martin Leshko
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