Least positive multiple of 2n-1 which is palindromic in base 2.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =9a(5) =33a(6) =65a(7) =15a(8) =17a(9) =513a(10) =21a(11) =2047a(12) =325a(13) =27a(14) =1421a(15) =31a(16) =33a(17) =455a(18) =2553a(19) =195a(20) =1025a(21) =129a(22) =45a(23) =4841a(24) =1421a(25) =51a(26) =3339a(27) =165a(28) =513a(29) =6077