Numbers whose base-9 representation has the same number of 3's and 7's.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =5a(5) =6a(6) =8a(7) =9a(8) =10a(9) =11a(10) =13a(11) =14a(12) =15a(13) =17a(14) =18a(15) =19a(16) =20a(17) =22a(18) =23a(19) =24a(20) =26a(21) =34a(22) =36a(23) =37a(24) =38a(25) =40a(26) =41a(27) =42a(28) =44a(29) =45