Primes p such that 10*p + 7 is also prime.

Terms

a(0) =3a(1) =13a(2) =19a(3) =31a(4) =61a(5) =67a(6) =79a(7) =97a(8) =109a(9) =127a(10) =163a(11) =199a(12) =223a(13) =229a(14) =241a(15) =277a(16) =283a(17) =313a(18) =367a(19) =379a(20) =421a(21) =433a(22) =439a(23) =463a(24) =487a(25) =523a(26) =541a(27) =547a(28) =571a(29) =619