Primes p such that 9*p + 4 is also prime.

Terms

a(0) =3a(1) =7a(2) =11a(3) =17a(4) =23a(5) =31a(6) =37a(7) =41a(8) =67a(9) =71a(10) =73a(11) =83a(12) =97a(13) =107a(14) =113a(15) =137a(16) =163a(17) =191a(18) =193a(19) =197a(20) =223a(21) =263a(22) =283a(23) =307a(24) =311a(25) =317a(26) =337a(27) =353a(28) =367a(29) =373