Positions of powers of 2 in A084680.

Terms

a(0) =1a(1) =3a(2) =9a(3) =11a(4) =17a(5) =33a(6) =51a(7) =73a(8) =99a(9) =101a(10) =137a(11) =153a(12) =187a(13) =219a(14) =257a(15) =303a(16) =353a(17) =411a(18) =449a(19) =561a(20) =641a(21) =657a(22) =771a(23) =803a(24) =909a(25) =1059a(26) =1111a(27) =1233a(28) =1241a(29) =1347