Number theory
sqrt(2) is irrational
fall of a ladder
Game on numbers
Factor
Divisible by 7
Divisible by 11
1234567890
Division problem
Pythagorean triple
1/x -1/y = 1/2015
1/a2
+ 1/b2 = 1/c2
120°
triangle
Integral
cyclic quadrilateral
Chinese remainder theorem
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