Number theory on square numbers
1001
Number of integer solutions of $x^2 + y^2 = k$
140433
The number of ways of writing an integer as a sum of two squares
116970
On the number divisors of a number
44790
Find $n$ for which $\frac{n(n+1)}{2}$ is perfect square
72666
Prime Numbers And Perfect Squares
45460
Proof verification of a number theory problem involving sequences.
19588
$n!+1$ being a perfect square
41789
Fermat's theorem on sums of two squares
73515
Primes Number Theory
72437
Sum of the digits of a perfect square
109305
Non-existence of natural numbers such that $\sqrt{n} +\sqrt{n+1} <\sqrt{x} +\sqrt{y} <\sqrt{4n+2}$
115454
Primality test bound: square root of n
34617
Number Theory: which primes are a sum of two squares?
4194
Which integers can be expressed as a sum of squares of two coprime integers?
19446
Number theory question from today's Pre - RMO
112867
Find all digits $a,b$ such that the number $\overline{aabb}$ is a perfect square
9146
Proving that a list of perfect square numbers is complete