Records in A385485.

Terms

a(0) =3a(1) =7a(2) =29a(3) =65a(4) =69a(5) =81a(6) =257a(7) =259a(8) =4097a(9) =4113a(10) =4129a(11) =262145a(12) =262149a(13) =1048577a(14) =1048583a(15) =16777217a(16) =16777219a(17) =38347927a(18) =214748365a(19) =214748369a(20) =4294967297a(21) =4294967299a(22) =68719476737a(23) =68719476769