\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Optional enrichment / non exigible. Bertrand series : determine the nature of \(\sum_{n \ge 2} 1/(n^\alpha (\ln n)^\beta)\) as a function of \((\alpha, \beta) \in \mathbb R^2\).
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