Numbers whose base-9 representation has the same number of 0's and 3's.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =6a(5) =7a(6) =8a(7) =10a(8) =11a(9) =13a(10) =14a(11) =15a(12) =16a(13) =17a(14) =19a(15) =20a(16) =22a(17) =23a(18) =24a(19) =25a(20) =26a(21) =27a(22) =37a(23) =38a(24) =40a(25) =41a(26) =42a(27) =43a(28) =44a(29) =46