Primes such that concatenation of two adjacent terms and two adjacent digits is also prime.

Terms

a(0) =2a(1) =3a(2) =7a(3) =19a(4) =73a(5) =1117a(6) =31a(7) =37a(8) =97a(9) =373a(10) =13a(11) =1171a(12) =11131a(13) =11113a(14) =79a(15) =71713a(16) =17137a(17) =11173a(18) =11719a(19) =717979a(20) =71719a(21) =731173a(22) =111373a(23) =11197a(24) =313a(25) =71971a(26) =11731a(27) =13171a(28) =11119a(29) =731737