Primes of the concatenated form 3nn3.

Terms

a(0) =313133a(1) =323233a(2) =328283a(3) =329293a(4) =338383a(5) =343433a(6) =349493a(7) =350503a(8) =352523a(9) =356563a(10) =364643a(11) =367673a(12) =380803a(13) =383833a(14) =392923a(15) =394943a(16) =395953a(17) =397973a(18) =3100010003a(19) =3100310033a(20) =3102410243a(21) =3102510253a(22) =3102810283a(23) =3103910393a(24) =3104610463