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Oct 2 at 15:57 comment added Steven Clark Cross-posted from Math StackExchange.
Oct 2 at 13:11 answer added Carlo Beenakker timeline score: 2
Oct 2 at 5:52 comment added Fedor Petrov You can consider the sum $f(t)= \sum_n e^{i(n+a)t}/(n+a) ^2$ for which you are interested in $f(\pi)$, and twice take a derivative by $t$
Oct 2 at 2:19 history asked Johann Wagner CC BY-SA 4.0