Primes of the form 4*k + 3.

Terms

a(0) =3a(1) =7a(2) =11a(3) =19a(4) =23a(5) =31a(6) =43a(7) =47a(8) =59a(9) =67a(10) =71a(11) =79a(12) =83a(13) =103a(14) =107a(15) =127a(16) =131a(17) =139a(18) =151a(19) =163a(20) =167a(21) =179a(22) =191a(23) =199a(24) =211a(25) =223a(26) =227a(27) =239a(28) =251a(29) =263