20 is the next number greater than 19. The next prime number greater than 19 is 23.
27.
i think the answere is 38
27, 26, 37, 37
The next number is 27. Nice puzzle! The reason is on discussion page, for those who are still working on it.
Next is xx which is 20 xix = 10 + (10-1) = 19
If you mean: 9, 19, 39, 69 then the next number in the sequence is 109
35
Ten.
67
10
The next number in the sequence is 27.