Number missing in sequence 29 38 3 8 14?

15. I arrived at this conclusion because of the following:

29, 38 The difference is 9 between 29, and 38.

3, 8 The difference is 5 between 3, and 8.

14, 15 The difference is 1 between 14, and 15.

The pattern is 9-4 = 5 and 5-4=1

So I have 9, 5, 1, a difference of 4.