Palindromic even numbers with an odd number of distinct prime factors.

Terms

a(0) =2a(1) =66a(2) =222a(3) =282a(4) =434a(5) =474a(6) =494a(7) =606a(8) =646a(9) =2222a(10) =2882a(11) =4334a(12) =4994a(13) =6006a(14) =6226a(15) =6446a(16) =6886a(17) =8338a(18) =8558a(19) =8778a(20) =8998a(21) =20002a(22) =20202a(23) =20702a(24) =20802a(25) =20902a(26) =22222a(27) =22922a(28) =24042a(29) =24342