Find $p$ : $p\mid k^2-5$
40156
Determine all primes $p$ for which $5$ is a quadratic residue modulo $p$
38876
$r! \equiv (−1)^k \pmod p$
22962
How to show $\binom{2p}{p} \equiv 2\pmod p$?
116215
Prove that $P(A \cap B\mid C)=P(A \mid (B \cap C))P(B\mid C)$
148217
A polynomial with integer coefficients that attains the value $5$ at four distinct points
834
If $p$ is a prime and $p \mid ab$, then $p \mid a$ or $p \mid b$.
87666
Find $n$ such that $n/2$ is a square, $n/3$ is a cube, and $n/5$ a fifth power
12229
If $x_1=5$, $x_{n+1}=x_n^2-2$, find $\lim x_{n+1}/(x_1\cdots x_n)$
119118
Prove $n\mid \phi(2^n-1)$
15436
Find p and q s.t. $({p-1})^{q-1}+({q-1})^{p-1} \equiv 101 \pmod {pq}$
96457
$p$-Splittable Integers
10589
How to factorize $5$ in $\mathbb{Z}[\root 3 \of 2]$?
11693
If $p \mid m^p+n^p$ prove $p^2 \mid m^p+n^p$
66960
Find a polynomial f(x) of degree 5 such that 2 properties hold.
112120
Find all primes of the form $2^{2^n} + 5$ for a nonnegative integer n
135768
Find $P(n+1)$ for a polynomial P
68776
Solve in $C$ : $P(z)=z^4+2z^3+5z^2+4z+1=0$ where $P(i-\frac{1}{2}+i\frac{\sqrt 3}{2})=0$