Numbers whose base-6 representation has the same number of 1's and 4's.

Terms

a(0) =0a(1) =2a(2) =3a(3) =5a(4) =10a(5) =12a(6) =14a(7) =15a(8) =17a(9) =18a(10) =20a(11) =21a(12) =23a(13) =25a(14) =30a(15) =32a(16) =33a(17) =35a(18) =40a(19) =52a(20) =58a(21) =60a(22) =62a(23) =63a(24) =65a(25) =70a(26) =72a(27) =74a(28) =75a(29) =77