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MathNet 2023-part-03 — 191 problems (EN–VI) Question 4

Math Olympiad Vault · MathNet 2023-part-03 — 191 problems (EN–VI)

Question 4

Determine all positive, composite integers $n$ that satisfy the following property: if the positive divisors of $n$ are $1=d_{1} \lt d_{2} \lt \cdots \lt d_{k}=n$, then $d_{i}$ divides $d_{i+1}+d_{i+2}$ for every $1 \leqslant i \leqslant k-2$.