Primes of form 4k+1 where k is a Pythagorean prime.

Terms

a(0) =53a(1) =149a(2) =293a(3) =389a(4) =773a(5) =1109a(6) =1493a(7) =1637a(8) =1733a(9) =2309a(10) =2693a(11) =2837a(12) =3413a(13) =3989a(14) =4133a(15) =4373a(16) =4517a(17) =5189a(18) =5717a(19) =5813a(20) =6197a(21) =6389a(22) =7013a(23) =7109a(24) =8069a(25) =8117a(26) =9173a(27) =9749a(28) =10709a(29) =10853