Numbers whose base-8 representation has the same number of 1's and 4's.

Terms

a(0) =0a(1) =2a(2) =3a(3) =5a(4) =6a(5) =7a(6) =12a(7) =16a(8) =18a(9) =19a(10) =21a(11) =22a(12) =23a(13) =24a(14) =26a(15) =27a(16) =29a(17) =30a(18) =31a(19) =33a(20) =40a(21) =42a(22) =43a(23) =45a(24) =46a(25) =47a(26) =48a(27) =50a(28) =51a(29) =53