Help to find the rule 2, 3, 5, 9, 19. What's the next number 2, 3, 5, 9, 19. What's the next number

Help to find the rule 2, 3, 5, 9, 19. What's the next number 2, 3, 5, 9, 19. What's the next number

forty-two
I'm an anonymous person on the first floor
I don't know how to use letters
sorry..