22
37.
The next number in the sequence would be 23. The sequence consists of prime numbers.
13.
The next number in the sequence 5-7-13-31 is 69.
27.
13, because if you add the last number to the current number you get the next number
The nest number in the sequence is 18. Note that the difference between each number and the next number in the sequence follows the simple sequence of 1,2,3,4. Obviously the next in the sequence of increases is 5, so 13+5=18.
The next number in the sequence is 27.
The next number in the sequence is 27.
These are Fibannoci's numbers. Therefore, the 7th number is 21.
It is 129.