Solving congruence problem
126725
If $p$ is prime and $p$ $\equiv$ $1$ (mod 4), then the congruence $x^2$ $\equiv$ $-1$ (mod $p$) has two incongruent solutions...
152333
A problem based on pigeonhole
60305
Proving the congruence $p^{q-1}+q^{p-1} \equiv 1 \pmod{pq}$
155012
Solving quadratic equations in modular arithmetic
325
If every pair of congruence equations admits solutions, then the entire system admits solutions
53503
Solving the diophantine equation $y^{2}=x^{3}-2$
158284
How to Solve this Arithmetic Progression Question?
59856
Find $x,y$ given $\gcd(x,y)$ and ${\rm lcm}(x,y)$
66161
How to solve the equation $n^2 \equiv 0 \pmod{584}$?
21874
Solve $x^3+x \equiv 1 \pmod p$
42754
Modular arithmetic: division, fractions, solving linear congruences
41673
Solve congruence system $\ x\equiv m_i-1 \pmod{m_i}\,$ for $\,i = 1,\ldots, k$
143754
Finding the solution of the congruence $4x\equiv16\pmod{26}$
157717
What is a mathematical solution to this problem? (Project Euler #106)
48949
Solving a Diophantine equation with a large solution
30045
Solving linear congruences by hand: modular fractions and inverses
26898
Trouble solving two number theoretical problems