Sir cu termeni irationali

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Marius Mainea
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Sir cu termeni irationali

Post by Marius Mainea »

Fie \( a_1,a_2,...,a_7\in\mathbb{Z}^{\ast} \) si \( x_n=a_1^n+a_2^n+...+a_7^n. \) Sa se arate ca exista o infinitate de numere naturale n pentru care \( \sqrt{x_n} \) este irational.
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