User talk:Crisófilax

Se puede ver asi $$\begin{matrix}\sum_{k=1}^n k^2\end{matrix}$$ o asi $$\sum_{k=1}^n k^2$$.


 * $$\sum_{1\le k\le n \atop (k,n)=1}\phi(k) = \frac{1}{2}n\phi(n)$$ for $$\;n>1$$


 * $$\sum_{r \in \mathbb{Q}^+}\frac{r^2}{2^{\text{num}(r)}-1}=\pi^2$$

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