Palindromic primes with nondecreasing sum of digits.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =151a(5) =181a(6) =191a(7) =353a(8) =373a(9) =383a(10) =727a(11) =757a(12) =787a(13) =797a(14) =17971a(15) =19891a(16) =19991a(17) =38783a(18) =74747a(19) =75557a(20) =76367a(21) =76667a(22) =77477a(23) =77977a(24) =78787a(25) =78887a(26) =79697a(27) =79997a(28) =1879781a(29) =1895981