GovernmentJobGroup(State and Central Govt.Jobs Info)

Find the missing term in each of the following series :-

(4) 1 , 2 , 3 , 6 , 9 , 18 , ? , 54
(5) 2 , 6 , 15 , 31 , 56 , 92 , ? .
(6) 3 , 7 , 23 , 95 , ? .