Tough mathematics question
11506
Alternative proof that $(a^2+b^2)/(ab+1)$ is a square when it's an integer
81267
A simple doubt in number theory problem.
23451
The new introduced EulerMatrix problem
129381
Modular equation problem
44879
Multiplicative inverse questions
129352
Duality discrete math problem
86067
A Variation of the even-town odd-town problem
106485
Olympiad Geometry Problem
132346
a linear algebra multiple choice problem
60661
How to solve this combination problem quickly?
84220
Questions on perfect squares
73287
Project Euler Question 14 (Collatz Problem)
41205
Help me solve a combinatorial problem
69748
Semi-Ambiguous Combinatorics Problem
15753
Solve the following equation in positive integers $x$ and $y$
57167
A hard problem on exponential integration
11824
A maximization problem