How few numbers is it possible to cross out from the sequence $$1, 2,3,..., 2023$$so that among those left no number is the product of any two (distinct) other numbers?
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Tags: combinatorics, number theory
How few numbers is it possible to cross out from the sequence $$1, 2,3,..., 2023$$so that among those left no number is the product of any two (distinct) other numbers?