Numbers whose base-3 representation Sum_{i=0..m} d(i)*3^(m-i) has even d(i) for all odd i.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =6a(5) =8a(6) =9a(7) =10a(8) =11a(9) =15a(10) =16a(11) =17a(12) =18a(13) =19a(14) =20a(15) =24a(16) =25a(17) =26a(18) =27a(19) =29a(20) =30a(21) =32a(22) =33a(23) =35a(24) =45a(25) =47a(26) =48a(27) =50a(28) =51a(29) =53