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MathNet 2002 — Part 01 Question 67

Math Olympiad Vault · MathNet 2002 — Part 01

Question 67

Let $n$ be a positive integer with at least four different positive divisors. The four smallest among these dividers are $d_{1}, d_{2}, d_{3}, d_{4}$. Find all such numbers $n$ for which applies
$$
d_{1}^{2}+d_{2}^{2}+d_{3}^{2}+d_{4}^{2}=n
$$