Numbers whose base-9 representation has the same number of 0's and 5's.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =7a(6) =8a(7) =10a(8) =11a(9) =12a(10) =13a(11) =15a(12) =16a(13) =17a(14) =19a(15) =20a(16) =21a(17) =22a(18) =24a(19) =25a(20) =26a(21) =28a(22) =29a(23) =30a(24) =31a(25) =33a(26) =34a(27) =35a(28) =37a(29) =38