Numbers whose base-2 representation is the juxtaposition of two identical strings.

Terms

a(0) =3a(1) =10a(2) =15a(3) =36a(4) =45a(5) =54a(6) =63a(7) =136a(8) =153a(9) =170a(10) =187a(11) =204a(12) =221a(13) =238a(14) =255a(15) =528a(16) =561a(17) =594a(18) =627a(19) =660a(20) =693a(21) =726a(22) =759a(23) =792a(24) =825a(25) =858a(26) =891a(27) =924a(28) =957a(29) =990