"2-ply" palindromic primes.

Terms

a(0) =11a(1) =101a(2) =131a(3) =151a(4) =181a(5) =191a(6) =313a(7) =353a(8) =373a(9) =383a(10) =727a(11) =757a(12) =787a(13) =797a(14) =919a(15) =929a(16) =10301a(17) =10501a(18) =10601a(19) =11311a(20) =11411a(21) =12421a(22) =12721a(23) =12821a(24) =13331a(25) =13831a(26) =13931a(27) =14341a(28) =14741a(29) =15451