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MathNet 2023-part-06 — 191 problems (EN–VI) Question 160

Math Olympiad Vault · MathNet 2023-part-06 — 191 problems (EN–VI)

Question 160

Prove that for infinitely many positive integers $k$, there are no positive integers $m$ and $n$ satisfying
$$
\frac{n^2 + m^2}{m^4 + n} = k.
$$