$p^2+1=q^2+r^2$. Strange phenomenon of primes
88794
Integral solutions of hyperboloid $x^2+y^2-z^2=1$
5142
Infinitely many primes of the form $pn+1$
66851
If $p,q$ are primes $(pq,a)=1$ and $p-1|q-1$ then prove $a^{q-1}\equiv 1\pmod{pq}$
47162
Proving there are infinitely many primes of the form $a2^k+1.$
42932
Prove that $p^j q^i$ cannot be a perfect number for $p, q$ odd, distinct primes.
96427
Why $f^{\prime}(z)=u_{x}+iv_{x}$?
37315
not both $2^n-1,2^n+1$ can be prime.
131551
$pq\mid pn^q+qn^p+kn$ for some $k,\,$ if $p,q$ are primes
38727
Modular Exponentiation and Primes
19979
Why does $p^2+8$ prime imply $p^3+4$ prime
75023
A finite sum of prime reciprocals
34617
Number Theory: which primes are a sum of two squares?
131731
Primes that can't be written as sum of two squares. Mod
45127
Why is Euler's totient function equal to $(p-1)(q-1)$ when $N=pq$ and $p$ and $q$ are prime in a clean intuitive way?
68376
How, if at all, does pure mathematics benefit from $2^{74207281}-1$ being prime?
52530
There exists a prime congruent to $m$ mod $p$
155886
let q be an odd prime and p a prime dividing $1+n+\dots+n^{q-1}$