Primes p such that 3p-2 and 3p+2 are primes (see A125272) and its decimal representation ends in 7.

Terms

a(0) =7a(1) =37a(2) =127a(3) =167a(4) =257a(5) =337a(6) =757a(7) =797a(8) =887a(9) =1307a(10) =1597a(11) =1657a(12) =1667a(13) =2347a(14) =2557a(15) =2897a(16) =2927a(17) =3067a(18) =4297a(19) =4327a(20) =4877a(21) =5087a(22) =5147a(23) =5227a(24) =5417a(25) =5857a(26) =6337a(27) =6827a(28) =6917a(29) =6967