Numbers whose base-11 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) =8a(7) =9a(8) =10a(9) =15a(10) =22a(11) =24a(12) =25a(13) =27a(14) =28a(15) =29a(16) =30a(17) =31a(18) =32a(19) =33a(20) =35a(21) =36a(22) =38a(23) =39a(24) =40a(25) =41a(26) =42a(27) =43a(28) =45a(29) =55