Primes == +-1 (mod 8).

Terms

a(0) =7a(1) =17a(2) =23a(3) =31a(4) =41a(5) =47a(6) =71a(7) =73a(8) =79a(9) =89a(10) =97a(11) =103a(12) =113a(13) =127a(14) =137a(15) =151a(16) =167a(17) =191a(18) =193a(19) =199a(20) =223a(21) =233a(22) =239a(23) =241a(24) =257a(25) =263a(26) =271a(27) =281a(28) =311a(29) =313