olymmath

OBM 2008 Problem 1

    A positive integer is dapper if at least one of its multiples begins with 20082008 . For example, 77 is dapper because 200858200858 is a multiple of 77 and begins with 20082008 . Observe that 200858=28694×7200858 = 28694\times 7 .

    Prove that every positive integer is dapper.

    Dataset text AI-MO AoPS. Quoted with source.

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