Smallest number whose Euler totient is divisible by 2^n.

Terms

a(0) =1a(1) =3a(2) =5a(3) =15a(4) =17a(5) =51a(6) =85a(7) =255a(8) =257a(9) =771a(10) =1285a(11) =3855a(12) =4369a(13) =13107a(14) =21845a(15) =65535a(16) =65537a(17) =196611a(18) =327685a(19) =983055a(20) =1114129a(21) =3342387a(22) =5570645a(23) =16711935a(24) =16843009a(25) =50529027a(26) =84215045a(27) =252645135a(28) =286331153a(29) =858993459