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MathNet 2019-part-01 — 184 problems (EN–VI) Question 128

Math Olympiad Vault · MathNet 2019-part-01 — 184 problems (EN–VI)

Question 128

A positive integer $n \gt 10$ has two different positive integer divisors $a$ and $b$ such that $n = a^2 + b$.
Prove that strictly between the numbers $a$ and $b$ there is at least one more divisor of $n$.