A problem on modular arithmetic.
34430
Why does $(\frac{p-1}{2}!)^2 = (-1)^{\frac{p+1}{2}}$ mod $p$?
34323
Prove that $a^{(p-1)/2} \equiv 1$ (mod p) and $a^{(p-1)/2} \equiv -1 \pmod p$
84879
Solving infinite sums with primes.
96237
$1^2 + 2^2 + 3^2 + \cdots + (n-1)^2 \equiv 0$ mod n iff $n \equiv \pm 1$ mod 6
45014
Modular exponentiation by repeated squaring
90537
Converse of Fermat's Little Theorem.
127901
If $x^2+y^2 \equiv 0\pmod{p}$, then $p \equiv 1 \pmod{4}$
155012
Solving quadratic equations in modular arithmetic
156089
Why is the associative property valid for modular arithmetic?
147485
A conjecture about numbers of the form $10^{m}(2^{k}−1)+2^{k-1}−1$, where $m$ is the number of decimal digits of $ 2^{k-1}$.
9039
What is the best way to solve modular arithmetic equations such as $9x \equiv 33 \pmod{43}$?
380
Bijection from modular multiplication?
144571
A conjecture including binomial coefficients
124995
$p\equiv 1,2,3\text{ mod }8 \Rightarrow p=a^2+2b^2\text{ for some $a,b\in\mathbb{Z}$.}$
101057
Show that $1^{p-1} + 2^{p-1} +\ldots + (p-1)^{p-1} \equiv -1 \mod p$
127816
Number theory proof mod p
23523
Two problems on number theory