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

17, 138, 307, 532, ?, 1182

What value should come in the place of (?) in the following number series?

?, 664, 706, 769, 853, 958

8 12 30 105 ? 2598.75

251, 130, 274, ?, 301, 76 

166        156       136      ?      66       16

196, 167, 144, ?, 108, 95

4        9       28       99       ?      2105      12660

1, 6, 27, 124, ?, 3906, 27391

18      ?      20      13       22       11

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

25, 25, 5, 10, 2, ?