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product of 100 pos. integers equal to product of 1.919 pos. integers

Source: 2020 Dutch BxMO TST p5

November 23, 2020
number theoryprimesProduct

Problem Statement

A set S consisting of 20192019 (different) positive integers has the following property: the product of every 100 elements of SS is a divisor of the product of the remaining 19191919 elements. What is the maximum number of prime numbers that SS can contain?