Palindromic numbers with prime middle digit.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =121a(5) =131a(6) =151a(7) =171a(8) =222a(9) =232a(10) =252a(11) =272a(12) =323a(13) =333a(14) =353a(15) =373a(16) =424a(17) =434a(18) =454a(19) =474a(20) =525a(21) =535a(22) =555a(23) =575a(24) =626a(25) =636a(26) =656a(27) =676a(28) =727a(29) =737