Solving $x^2= x\ \pmod{ 111 5111}$
3563
Find all roots of $\,x^2\!\equiv x\pmod{\!900}$, i.e all idempotents in $\Bbb Z_{900}$
80875
Congruence equation ...
22029
Solving modular arithmetic questions
91565
How to efficiently compute $\,25^{37}\pmod{55}$?
53503
Solving the diophantine equation $y^{2}=x^{3}-2$
135465
Group theory proof of existence of a solution to $x^2\equiv -1\pmod p$ iff $p\equiv 1 \pmod 4$
145617
Is there any simple trick to solve the congruence $a^{24}\equiv6a+2\pmod{13}$?
122741
$x^2$ is congruent to $-1 \bmod p$
36611
Algorithms for solving the discrete logarithm $a^x \equiv b\pmod{n}$ when $\gcd(a,n) \neq 1$
124241
Finding all integers $k \geq 2$ such that $k^2 \equiv 5k \pmod{15}$. What is going on here?
56803
Finding solutions to congruence equations
66623
Primes dividing $11, 111, 1111, ...$
63194
Find all integer solutions to $x^2-2y^2=1$
127945
Number of solutions to the congruence $x^q \equiv 1 \mod p$.
29640
If $x \equiv 1 \pmod 3$ and $x \equiv 0 \pmod 2$, what is $x \pmod 6$?
1001
Number of integer solutions of $x^2 + y^2 = k$
77024
Find the number of solutions of $x^2=x\mod m$ for any integer $m$