Number theory · Diophantine equations · Perfect squares · Divisibility

Problem 4, 2023

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Determine all natural numbers \(n\) for which the number

\[ n^2 + 7n + 2 \]

is equal to a product of several (at least two) consecutive natural numbers.

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Serbian Municipal Competition 2023, high school grade I, category A, problem 4. Organized by the Mathematical Society of Serbia (DMS). Source

City problem · Number theory · Lemma