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timon92

Apparently, this user prefers to keep an air of mystery about them.

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17 Solutions to $a,\ b,\ c,\ \frac{a}{b}+\frac{b}{c}+\frac{c}{a},\ \frac{b}{a} + \frac{c}{b} + \frac{a}{c} \in \mathbb{Z}$ Dec 10 '18
14 A circle tangent to an ellipse Jul 15 '17
12 Let $S(n)$ be the sum of the digits of a number $n$. Solve $n+S(n)+S(S(n))=1993$ Mar 21 '15
12 If two sets $A$ and $B$ have equal power sets, can we conclude that $A=B$? Oct 7 '15
10 How to prove :$\sqrt{1!\sqrt{2!\sqrt{3!\sqrt{\cdots\sqrt{n!}}}}} <3$ Jan 5 '18
9 A Pigeonhole-Principle from IMO Shortlist. Nov 6 '17
9 What is the geometry behind $\frac{\tan 10^\circ}{\tan 20^\circ}=\frac{\tan 30^\circ}{\tan 50^\circ}$? Jan 24 '16
9 Assuming $ab^2 = b^3a$ and $a^2=1$ prove that the order of $b$ is $5$. Mar 26 '16
8 Find $x$ and $y$ where $20!=\overline{24329020081766xy\dots}$ Aug 11 '16
8 On the convergence of the sequence $\,a_n=\displaystyle\sum_{k=1}^{n-1}\left(\frac{n}{k(n-k)}\right)^{2}$ Dec 31 '16
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