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Top posts (78) All Questions Answers | Votes Newest

11 Maximum value of $x$ such that $3^x-2^n$ is a prime. Sep 30
8 For what values of n is $2^{2n} -1$ divisible by $4n+1$ Sep 27
5 Finding longest sequence such that $4k + 1$ is neither prime nor a perfect square Sep 22
5 Finding sum of digits of a number in an olympiad question. Oct 15
5 Recurrence series $ƒ(n+1)=\frac{f(n)-1}{f(n)+1} $ Oct 12
5 The roots of the equation $2x^2 - 4x + 5 = 0$ are $\alpha$ and $\beta$ 4 hours ago
4 Show that there isn't $k\in\Bbb Z^+$ such that $k^3 + 2k^2 + 2k + 1$ is cube number Oct 19
4 Maximum value of $a+b+c$ in an inequality 2 days ago
4 Find all pairs of integers $(x,y)$ such that $x^{2}+y^{2}=(x-y)^{3}$. Sep 29
4 Given 2 sides of a triangle find cosine of an angle Oct 8
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