Numbers whose base-5 representation has the same number of 0's and 1's.

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =12a(5) =13a(6) =14a(7) =17a(8) =18a(9) =19a(10) =22a(11) =23a(12) =24a(13) =27a(14) =28a(15) =29a(16) =35a(17) =40a(18) =45a(19) =51a(20) =55a(21) =62a(22) =63a(23) =64a(24) =67a(25) =68a(26) =69a(27) =72a(28) =73a(29) =74