Who found the ‘Happy Club’ organisation?

Find the missing number in the given number series.

2, 5, 16, 65, 326, ?

18, 10, 12, 21, ?, 120

16, 20, 47, 63, 188, ?

21         24          22         25       23         ? 

17, 38, 123, 508, ?, 15426

52      83      114      ?      176       207

480, 288, ?, 103.68, 62.208, 37.3248

827, 820, 806, 785, 757, ?

What will come in place of the question mark (?) in the following series?

110, 120, ?, 146, 162, 180

Find the missing number in the given number series.

1, 2, 3, 6, 11, 20, ?