Numbers whose base-4 representation contains exactly three 0's and four 1's.

Terms

a(0) =4117a(1) =4165a(2) =4177a(3) =4180a(4) =4357a(5) =4369a(6) =4372a(7) =4417a(8) =4420a(9) =4432a(10) =5125a(11) =5137a(12) =5140a(13) =5185a(14) =5188a(15) =5200a(16) =5377a(17) =5380a(18) =5392a(19) =5440a(20) =16470a(21) =16471a(22) =16473a(23) =16477a(24) =16485a(25) =16501a(26) =16533a(27) =16597a(28) =16662a(29) =16663