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It is well known that we can map $n\in\mathbb N$ to the $n$-th prime number, can this map be extended holomorphically to the complex plane? If so, are there any good properties of it?

It seems an interesting question but I did not search anything related to it. Thanks!

Bernard
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Faye Tao
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1 Answers1

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$$e^{x} \sum_{n\ge 1} \frac{p_n}{e^n}\frac{\sin(\pi (x-n))}{\pi (x-n)}$$ It is entire because the summand are entire and the series converges locally uniformly.

The same method works for any sequence, all we have to do is to replace $e^x, 1/e^n$ by $f(x),1/f(n)$ where $f$ is an entire function growing fast enough.

reuns
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