a_MSE_user

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Is there any sequence $a_n$ of nonnegative numbers for which $\sum_{n \geq 1}a_n^2 <\infty$ and $\sum_{n \geq 1}\left(\sum_{k \geq 1}\frac{a_{kn}}{k}\right)^2=\infty$?

sequences-and-series divergent-series

jan 13 12 at 7:07 Péter Komjáth 3,428●13●19

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Prime generating algorithm

algorithms prime-numbers

sep 29 11 at 13:27 Seva 4,993●1●8●27

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sequences-and-series
prime-numbers
divergent-series
algorithms

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