Number theory · Primes · Divisibility · Case analysis · Bounding arguments

Problem 5, 2024

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Determine all quintuples of primes \(p_{1} \le p_{2} \le p_{3} \le p_{4} \le p_{5}\) with the property that each of the five primes divides the sum of the remaining four.

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Slovenian High School Mathematics Competition for Vega Awards (MaSSA), drzavno (national) round 2024, 1. letnik, category A, problem B2. Organized by DMFA Slovenije (Society of Mathematicians, Physicists and Astronomers of Slovenia). Source

National problem · Number theory · Lemma