Smallest k>2^n such that 2^k == 2^n (mod k).

Terms

a(0) =3a(1) =6a(2) =9a(3) =20a(4) =56a(5) =66a(6) =133a(7) =260a(8) =513a(9) =1030a(10) =2091a(11) =4128a(12) =8593a(13) =16394a(14) =33195a(15) =65584a(16) =131345a(17) =262176a(18) =524989a(19) =1048660a(20) =2097291a(21) =4195642a(22) =8388997a(23) =16777272a(24) =33554525a(25) =67109198a(26) =134217729a(27) =268435468a(28) =536875753a(29) =1073741910