Cubefree composite palindromes.

Terms

a(0) =4a(1) =6a(2) =9a(3) =22a(4) =33a(5) =44a(6) =55a(7) =66a(8) =77a(9) =99a(10) =111a(11) =121a(12) =141a(13) =161a(14) =171a(15) =202a(16) =212a(17) =222a(18) =242a(19) =252a(20) =262a(21) =282a(22) =292a(23) =303a(24) =323a(25) =333a(26) =363a(27) =393a(28) =404a(29) =414