Primes of the form 9*k^2 + 3*k + 1.

Terms

a(0) =13a(1) =43a(2) =157a(3) =241a(4) =463a(5) =601a(6) =757a(7) =1123a(8) =2971a(9) =3307a(10) =4423a(11) =4831a(12) =5701a(13) =6163a(14) =8191a(15) =9901a(16) =11131a(17) =12433a(18) =13807a(19) =19183a(20) =20023a(21) =21757a(22) =22651a(23) =23563a(24) =26407a(25) =28393a(26) =35911a(27) =37057a(28) =53593a(29) =60763