Fermat Chrismas theorem
Trivia · proposed by @vipproaccout
Which of the following forms of prime numbers can be expressed as a sum of two squares?
A$4k+3, \forall k\in\mathbb{N}$
B$4k+1, \forall k\in\mathbb{N}$
C$5k+4, \forall k\in\mathbb{N}$
D$11k+5, \forall k\in\mathbb{N}$