Primes that are concatenations of n with n + 2.

Terms

a(0) =13a(1) =79a(2) =911a(3) =2729a(4) =3739a(5) =4547a(6) =4951a(7) =5153a(8) =5557a(9) =6163a(10) =6971a(11) =7577a(12) =105107a(13) =109111a(14) =115117a(15) =117119a(16) =121123a(17) =151153a(18) =159161a(19) =181183a(20) =187189a(21) =195197a(22) =201203a(23) =211213a(24) =217219a(25) =225227a(26) =247249a(27) =271273a(28) =277279a(29) =285287