IL-GILLIS 2021 Problem 4
Danny likes seven-digit numbers with the following property: the 1's digit is divisible by the 10's digit, the 10's digit is divisible by the 100's digit, and so on. For example, Danny likes the number but doesn't like .
Is the amount of numbers Danny likes divisible by ?
Dataset text AI-MO AoPS. Quoted with source.
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