Palindromes with exactly 2 distinct prime factors.

Terms

a(0) =6a(1) =22a(2) =33a(3) =55a(4) =77a(5) =111a(6) =141a(7) =161a(8) =202a(9) =262a(10) =303a(11) =323a(12) =393a(13) =454a(14) =505a(15) =515a(16) =535a(17) =545a(18) =565a(19) =626a(20) =707a(21) =717a(22) =737a(23) =767a(24) =818a(25) =838a(26) =878a(27) =898a(28) =939a(29) =949