Concatenation of palindrome k and its 10's complement is prime.

Terms

a(0) =1a(1) =3a(2) =7a(3) =77a(4) =99a(5) =151a(6) =161a(7) =333a(8) =707a(9) =727a(10) =737a(11) =757a(12) =949a(13) =969a(14) =989a(15) =1441a(16) =1551a(17) =1771a(18) =1881a(19) =3003a(20) =7227a(21) =7667a(22) =7997a(23) =9009a(24) =9339a(25) =9999a(26) =10001a(27) =10101a(28) =10701a(29) =11111