Timeline for Is there any sequence $a_n$ of nonnegative numbers for which $\sum_{n \geq 1}a_n^2 <\infty$ and $\sum_{n \geq 1}\left(\sum_{k \geq 1}\frac{a_{kn}}{k}\right)^2=\infty$?
Current License: CC BY-SA 3.0
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| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 24, 2019 at 11:20 | review | Low quality posts | |||
| Jun 24, 2019 at 11:57 | |||||
| Jan 13, 2012 at 7:07 | history | answered | Péter Komjáth | CC BY-SA 3.0 |