Top network posts

• 42 Are there infinitely many $x$ for which $\pi(x) \mid x$?
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• 11 Summing ${\frac{1}{n^2}}$ over subsets of $N$.
• 7 Factorial equaling a polynomial
• 5 Proving inequality $x^{10}-x^6+x^2-x+1>0$
• 5 Maximal number of vectors with (pairwise) negative scalar product
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