Numbers whose base-5 representation has the same number of 1's and 4's.

Terms

a(0) =0a(1) =2a(2) =3a(3) =9a(4) =10a(5) =12a(6) =13a(7) =15a(8) =17a(9) =18a(10) =21a(11) =29a(12) =39a(13) =44a(14) =45a(15) =47a(16) =48a(17) =50a(18) =52a(19) =53a(20) =59a(21) =60a(22) =62a(23) =63a(24) =65a(25) =67a(26) =68a(27) =71a(28) =75a(29) =77