Positive numbers having the same set of digits in base 2 and base 4.

Terms

a(0) =1a(1) =4a(2) =16a(3) =17a(4) =20a(5) =64a(6) =65a(7) =68a(8) =69a(9) =80a(10) =81a(11) =84a(12) =256a(13) =257a(14) =260a(15) =261a(16) =272a(17) =273a(18) =276a(19) =277a(20) =320a(21) =321a(22) =324a(23) =325a(24) =336a(25) =337a(26) =340a(27) =1024a(28) =1025a(29) =1028