Numbers whose base-5 representation has the same number of 1's and 3's.

Terms

a(0) =0a(1) =2a(2) =4a(3) =8a(4) =10a(5) =12a(6) =14a(7) =16a(8) =20a(9) =22a(10) =24a(11) =28a(12) =38a(13) =40a(14) =42a(15) =44a(16) =48a(17) =50a(18) =52a(19) =54a(20) =58a(21) =60a(22) =62a(23) =64a(24) =66a(25) =70a(26) =72a(27) =74a(28) =76a(29) =80