Palindromic terms from A019546.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =353a(5) =373a(6) =727a(7) =757a(8) =32323a(9) =33533a(10) =35353a(11) =35753a(12) =37273a(13) =37573a(14) =72227a(15) =72727a(16) =73237a(17) =75557a(18) =77377a(19) =3222223a(20) =3223223a(21) =3233323a(22) =3252523a(23) =3272723a(24) =3337333a(25) =3353533a(26) =3553553a(27) =3722273a(28) =3732373a(29) =3773773