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MathNet 2009-part-02 — 175 problems (EN–VI) Question 89

Math Olympiad Vault · MathNet 2009-part-02 — 175 problems (EN–VI)

Question 89

Determine all prime numbers $p_{1}, p_{2}, \ldots, p_{12}, p_{13}$, $p_{1} \leq p_{2} \leq \ldots \leq p_{12} \leq p_{13}$, such that
$$
p_{1}^{2}+p_{2}^{2}+\ldots+p_{12}^{2}=p_{13}^{2}
$$
and one of them is equal to $2 p_{1}+p_{9}$.