Primes p such that order of 2 mod p (=A007733(p)) is even.

Terms

a(0) =3a(1) =5a(2) =11a(3) =13a(4) =17a(5) =19a(6) =29a(7) =37a(8) =41a(9) =43a(10) =53a(11) =59a(12) =61a(13) =67a(14) =83a(15) =97a(16) =101a(17) =107a(18) =109a(19) =113a(20) =131a(21) =137a(22) =139a(23) =149a(24) =157a(25) =163a(26) =173a(27) =179a(28) =181a(29) =193