1. 0, 1, 3, 6, 10, 15, x

    23

    19

    21

    22

2. 1, 4, 27, 256, x

    729

    125

    81

    3125

3. 1, 1, 2, 3, 5, 8, 13, 21, x

    30

    34

    26

    29

4. 1, 2, 4, 8, 16, 32, 64, 128, x - 'x' is a three digit number

5. 1, 4, 6, 9, 11, 14, 16, 19, x

    21

    19

    22

    24

6. 3, 1, 2, 0, 1, -1, x - a single digit whole number

7. 1, 3, 5, 7, x - x is a single digit number.

8. 1, 8, 27, 64, 125, 216, x

    300

    334

    324

    343

9. -1, 0, 3, 8, 15, 24, 35, 48, 63, 80, x

    98

    99

    100

    101

10. 1, -1, 2, 0, 3, x

    0

    1

    -1

    5

11. 7, 14, 21, 28, 35, x - x is a two digit number

12. 1, 2, 4, 7, 11, 16, 22, x

    25

    27

    28

    29

13. 1, 8, 5, 12, 9, 16, 13, 20, x

    17

    27

    37

    47

14. 1, 2, 5, 14, 41, x

    68

    73

    122

    256

15. 1, 2, 3, 4, 5, 6, 7, x - No hint needed i hope!