Find all primes p such that p!+p is a perfect square
34588
Number Theory: $p!+p=n^2$, $p$ = prime
131551
$pq\mid pn^q+qn^p+kn$ for some $k,\,$ if $p,q$ are primes
98468
Are there infinitely many primes of the form $n!+1$?
54359
Odd Primes Problem Proof
72437
Sum of the digits of a perfect square
147848
Integer $x$ for which $x^4+x^3+x^2+x+1$ is perfect square.
146512
Prove that for every prime number $p>3$, $4p^2+1$ can be written as the sum of three square numbers
134121
Determining all the positive integers $n$ such that $n^4+n^3+n^2+n+1$ is a perfect square.
38748
There are infinitely many prime numbers $p$ for which $p + 2$ and $p + 4$ are also prime numbers
66216
Squares, Cubes and Prime numbers
4943
If $p,q,r$ are all primes,and $p|qr-1$,$q|pr-1$ and $r|pq-1$,find all possible values of $pqr$.
112867
Find all digits $a,b$ such that the number $\overline{aabb}$ is a perfect square
93898
Prove that for any prime p, there is a complete set of mod p residues {q1, . . . , qp}, where each qi is prime.
50781
$(n+1)$th prime $p_{n+1}$ less than or equal to $p_1p_2\dots p_n+1$
12250
How to find the prime factorization of $100!$.
84220
Questions on perfect squares
118538
Find all integers $x$ such that $x^2+3x+24$ is a perfect square.