Definition:Pythagorean Prime

Definition
A Pythagorean prime is a prime number of the form:
 * $p = 4 n + 1$

where $n \in \Z_{\ge 0}$ is a positive integer.

Also see

 * Fermat's Two Squares Theorem: such a prime number is uniquely the sum of two squares


 * Definition:Non-Pythagorean Prime