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 Oct 6 awarded Notable Question Mar 2 awarded Popular Question Nov 25 awarded Notable Question Sep 10 awarded Popular Question Jul 2 awarded Curious Jan 20 awarded Popular Question Jul 31 awarded Popular Question May 23 awarded Yearling Dec 22 accepted How many all prime numbers p with length of bits of p = 1024 bits? Dec 22 asked How many all prime numbers p with length of bits of p = 1024 bits? Dec 8 answered Show that $\alpha_1u+\alpha_2v+\alpha_3w=0\Rightarrow\alpha_1=\alpha_2=\alpha_3=0$ Dec 7 accepted How to calculate this limit $\lim\limits_{n\to\infty}\left(\sum\limits_{i=1}^{n}\frac{1}{\sqrt{i}} - 2\sqrt{n}\right)$ Dec 7 accepted Why can $N$ not be the subgroup $\{I, F\}$? Dec 7 comment Why can $N$ not be the subgroup $\{I, F\}$? thanks, but what's picture on en.wikipedia.org/wiki/Dihedral_group#Definition??? Dec 7 asked Why can $N$ not be the subgroup $\{I, F\}$? Dec 7 asked Prove that $f$ is not onto Feb 15 asked How to calculate this limit $\lim\limits_{n\to\infty}\left(\sum\limits_{i=1}^{n}\frac{1}{\sqrt{i}} - 2\sqrt{n}\right)$ Dec 28 accepted Finding the asymptotics of a summation $\sum_{k=1}^{n}\frac{n-k+1}{k}$ Dec 28 revised Finding the asymptotics of a summation $\sum_{k=1}^{n}\frac{n-k+1}{k}$ added 226 characters in body Dec 28 comment Finding the asymptotics of a summation $\sum_{k=1}^{n}\frac{n-k+1}{k}$ I found $\mathcal{O}(S_n) = n^2$. Thus, having $(n-k+1)/k = (n+1)/k -1 \leq n$. ==> $S_n = \sum_{k = 1} ^ {n}n = n^2$. But I cant find $\mathcal{\Omega}(S_n)$, so I cant also find $\mathcal{\Theta}(S_n)$