Numbers whose base-4 representation contains exactly three 0's and four 3's.

Terms

a(0) =12351a(1) =12495a(2) =12531a(3) =12540a(4) =13071a(5) =13107a(6) =13116a(7) =13251a(8) =13260a(9) =13296a(10) =15375a(11) =15411a(12) =15420a(13) =15555a(14) =15564a(15) =15600a(16) =16131a(17) =16140a(18) =16176a(19) =16320a(20) =16639a(21) =17215a(22) =17359a(23) =17395a(24) =17404a(25) =19519a(26) =19663a(27) =19699a(28) =19708a(29) =20239