Palindromic primes with middle digit 9.

Terms

a(0) =191a(1) =797a(2) =13931a(3) =17971a(4) =19991a(5) =71917a(6) =77977a(7) =79997a(8) =94949a(9) =95959a(10) =1129211a(11) =1409041a(12) =1469641a(13) =1489841a(14) =1579751a(15) =1589851a(16) =1609061a(17) =1829281a(18) =1879781a(19) =1909091a(20) =1969691a(21) =3089803a(22) =3319133a(23) =3329233a(24) =3439343a(25) =3449443a(26) =3479743a(27) =3569653a(28) =3589853a(29) =3689863