Palindromic primes with just two distinct digits.

Terms

a(0) =101a(1) =131a(2) =151a(3) =181a(4) =191a(5) =313a(6) =353a(7) =373a(8) =383a(9) =727a(10) =757a(11) =787a(12) =797a(13) =919a(14) =929a(15) =11311a(16) =11411a(17) =13331a(18) =15551a(19) =16661a(20) =18181a(21) =19991a(22) =32323a(23) =33533a(24) =35353a(25) =72227a(26) =72727a(27) =74747a(28) =75557a(29) =76667