Jun 202012

Let \(\Bbb P\) be the set of all primes, the set

\[\{\sin p \mid p\in\Bbb P\} \]

is dense  in \([-1,1]\).

This problem appeared in artofproblemsolving  on 22 May 2004, and  has been solved in a french math forum. The solution used tools as Fourier analysis, Vinogradov’s theorem, Erdos-Turan inequality and many others things.

 Posted by at 3:32 am

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