olymmath

IR-MO-R2 2021 Problem 2

    Call a positive integer nn "Fantastic" if none of its digits are zero and it is possible to remove one of its digits and reach to an integer which is a divisor of nn . ( for example , 25 is fantastic , as if we remove digit 2 , resulting number would be 5 which is divisor of 25 ) Prove that the number of Fantastic numbers is finite.

    Dataset text AI-MO AoPS. Quoted with source.

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