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

Terms

a(0) =6a(1) =22a(2) =202a(3) =262a(4) =454a(5) =626a(6) =818a(7) =838a(8) =858a(9) =878a(10) =898a(11) =2002a(12) =2442a(13) =4774a(14) =6666a(15) =20302a(16) =20602a(17) =22322a(18) =22422a(19) =22522a(20) =22622a(21) =22722a(22) =22822a(23) =24142a(24) =24242a(25) =24842a(26) =26562a(27) =26662a(28) =26762a(29) =26962