How much prime satisfy this condition?
21898
Find all primes $p$ such that $ p^3-4p+9 $ is a perfect square.
16459
Limit of ratios of numbers with $m$ factors and primes
126945
checking if a number is a prime
75206
If $a$, $a+2$ and $a+4$ are prime numbers then, how can one prove that there is only one solution for $a$?
107037
How to find prime numbers between 0 - 100?
32618
Suppose $p$ is a prime number such that $(p-1)/4$ and $(p+1)/2$ are also primes. Show that $p=13$
131479
How do I prove that 15462227 and 15462229 relatively prime?
155886
let q be an odd prime and p a prime dividing $1+n+\dots+n^{q-1}$
111490
Proof that every number has at least one prime factor
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 $p|y^2−y+ 25$.
55060
Prove that $n^2+n+41$ is prime for $n<40$
92737
primes whose difference is a multiple of $n$
14724
For primes $p≡3\pmod 4$, prove that $[(p−1)/2]!≡±1\pmod p$.
75733
Divisibility of prime numbers
146066
Fastest way to find if a given number is prime
123033
Showing a number $n$ is prime if $(n-2)! \equiv 1 \pmod n$
59036
If $a^{n}-1$ is prime then $a=2$ and $n$ is prime?