Primes that are concatenations of k with k + 6.

Terms

a(0) =17a(1) =1117a(2) =1319a(3) =1723a(4) =2531a(5) =3137a(6) =3541a(7) =4349a(8) =6571a(9) =7177a(10) =8389a(11) =95101a(12) =97103a(13) =101107a(14) =125131a(15) =127133a(16) =137143a(17) =151157a(18) =155161a(19) =157163a(20) =161167a(21) =163169a(22) =167173a(23) =187193a(24) =197203a(25) =203209a(26) =205211a(27) =211217a(28) =217223a(29) =221227