A number theory problem, about prime number
3694
Show $GCD(a_1, a_2, a_3, \ldots , a_n)$ is the least positive integer that can be expressed in the form $a_1x_1+a_2x_2+ \ldots +a_nx_n$
111967
Let $p$ be a prime number. Prove that there exists $x∈Z$ for which $p|x^2−x+ 3$ if and only if there exists $y∈Z$ for which $p|y^2−y+ 25$.
34588
Number Theory: $p!+p=n^2$, $p$ = prime
131488
Show that $p^3+4$ is prime
14783
A Number Theory problem (GCD)
54547
Prove this number must be a prime number or 1.
78342
When is $\phi(n)$ a prime number?
50412
Prime elements in $\mathbb{Z}/n\mathbb{Z}$
63702
There is a prime between $n$ and $n^2$, without Bertrand
11440
When is the number $11111\cdots1$ a prime number?
39915
Let $n$ be an integer such that if $d | n$ then $d + 1 | n + 1.$ Show that $n$ is a prime number
147317
multiple choice question on number theory
72666
Prime Numbers And Perfect Squares
126015
Elementary number theory in sets
44019
Show that for any prime $ p $, there are integers $ x $ and $ y $ such that $ p|(x^{2} + y^{2} + 1) $.
81267
A simple doubt in number theory problem.
3632
Basic number theory proofs