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

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =9a(5) =10a(6) =11a(7) =18a(8) =19a(9) =20a(10) =27a(11) =30a(12) =33a(13) =54a(14) =57a(15) =60a(16) =81a(17) =82a(18) =83a(19) =90a(20) =91a(21) =92a(22) =99a(23) =100a(24) =101a(25) =162a(26) =163a(27) =164a(28) =171a(29) =172