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Mathematics
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Roby5
  • Member for 9 years, 2 months
  • Last seen more than 1 year ago
  • Somewhere in this world
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12
Show that $3^{2008}$ + $4^{2009}$ can be written as product of two positive integers each of which is larger than $2009^{182}$.
May 30, 2016
9
Find $x+y+z$ From Equations Including Radicals
Aug 26, 2016
8
How much is the minimum of $\frac{a}{b}+\frac{b}{c}+\frac{c}{a}$
Jul 11, 2016
7
Find all positive integers satisfying: $x^5+y^6=z^7$
Jul 12, 2016
7
The numbers $1,\frac{1}{2},\frac{1}{3},\dots,\frac{1}{100}$ are written on a white board
Aug 3, 2016
7
Show that $7^{\sqrt {5}}>5^{\sqrt {7}}.$
May 17, 2016
6
Brocard Angles proof by Sine and cosine formulae.
Jun 21, 2016
6
Find all prime $a, b, c$ such that $ab+bc+ac > abc$
May 31, 2017
6
The function $f$ has property: $f(x)+f(1/x)=x$ and what is the largest set of real numbers?
Jul 6, 2016
6
If $n$ is an integer then $4$ does not divide $n^2 - 3$
Aug 3, 2016
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13
Inequality with strange equality conditions
11
A mathematically strange rebus
7
Who's not welcome here?
6
Function(al) Puzzle
5
Iterative Floors and Ceilings