Forgive me if this is the wrong section for this, but I study maths in French.

This is about sequences and series; to be more precise, it is about finding their nature, which is either divergent or convergent, by using different methods (Cauchy, D'Alembert, Reiman...). I study maths in French, so some things might not make sense since they are directly translated by me, but after all maths is one language.

I want to determine whether this sequence is convergent or divergent: Un=

This is about sequences and series; to be more precise, it is about finding their nature, which is either divergent or convergent, by using different methods (Cauchy, D'Alembert, Reiman...). I study maths in French, so some things might not make sense since they are directly translated by me, but after all maths is one language.

I want to determine whether this sequence is convergent or divergent: Un=

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