Palindromic primes with middle digit 4.

Terms

a(0) =11411a(1) =12421a(2) =15451a(3) =17471a(4) =18481a(5) =30403a(6) =32423a(7) =77477a(8) =78487a(9) =96469a(10) =1074701a(11) =1114111a(12) =1134311a(13) =1374731a(14) =1444441a(15) =1464641a(16) =1594951a(17) =1654561a(18) =1684861a(19) =1714171a(20) =1734371a(21) =1764671a(22) =1824281a(23) =1884881a(24) =1924291a(25) =1984891a(26) =3064603a(27) =3304033