What is the next number in the series 9, 5, 14, 19, and 33?

Question

Find the number that comes next in the following series:

3, 7, 12, 14, 16, 19, 21, 25, 30, 41, 45, 52, 54, 56, 59, 61, 65, 70, ?

Answer 1

19+33=52

Answer 2

9 + (-4) = 5
(5) + 9 = 14
14 + (5) = 19
(19) + 14 = 33
33 + (19) = [52].