Primes, Fermat's Theorem on sum of two squares
50128
Efficiently finding two squares which sum to a prime
23830
Proof that if $p\equiv3\,\left(\mbox{mod 4}\right)$ then $p$ can't be written as a sum of two squares
45882
Solving a congruence without Fermat's little theorem
75011
Primes of the form $n^2+1$ - hard?
58114
For which primes p is $p^2 + 2$ also prime?
138081
How to determine whether a number can be written as a sum of two squares?
138259
Proof or disproof that every integer can be written as the sum of a prime and a square.
155452
Prime factorization of square numbers
58264
How to derive the formula for the sum of the first $n$ perfect squares?
68233
Fermat's little theorem's proof for a negative integer
78917
Show that for any prime numbers $p,q,r$, one has $p^2+q^2 \ne r^2$.
1189
Using Fermats prime numbers to prove that there is infinitely many prime numbers
56328
Find p is the prime number which $\frac{p+1}{2}$ and $\frac{p^2+1}{2}$ both are square number.
79718
Does the alternating sum of prime reciprocals converge?
129755
Weighted sum of squares, in a finite field
19164
On the GCD of a Pair of Fermat Numbers
130300
Proof that every quadratic residue has two roots, modulo a prime