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MathNet 2023 — batch of 35 questions Question 25

Math Olympiad Vault · MathNet 2023 — batch of 35 questions

Question 25

What is the maximum number of integers that can be chosen from $1, 2, \ldots, 99$ so that the chosen integers can be arranged in a circle with the property that the product of every pair of neighbouring integers is a 3-digit number?