Tolong jelaskan mengenai Pythagorean primes dari Daftar bilangan prima

Of the form 4n + 1.

5, 13, 17, 29,  37, 41, 53, 61, 73, 89, 97, 101, 109, 113, 137, 149, 157, 173, 181, 193, 197, 229, 233, 241, 257, 269, 277, 281, 293, 313, 317, 337, 349, 353, 373, 389, 397, 401, 409, 421, 433, 449 ()