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MathNet 2019-part-02 — 184 problems (EN–VI) Question 9

Math Olympiad Vault · MathNet 2019-part-02 — 184 problems (EN–VI)

Question 9

An integer $m \gt 1$ is rich if for any positive integer $n$, there exist positive integers $x, y, z$ such that $n = m x^{2} - y^{2} - z^{2}$. An integer $m \gt 1$ is poor if it is not rich.

a) Find a poor integer.

b) Find a rich integer.