24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
24
These are just the first prime numbers. The next few are 13, 17, 19, 23, 29, 31...
The next number in the sequence is 27.
2 3 5 7 11 13 17 19 23 29 31 They are prime numbers.
27.
27, 26, 37, 37
20 is the next number greater than 19. The next prime number greater than 19 is 23.
The next number is 27. Nice puzzle! The reason is on discussion page, for those who are still working on it.
Next number will be.. 19.
24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
31
24
These are just the first prime numbers. The next few are 13, 17, 19, 23, 29, 31...
If you mean: 9, 19, 39, 69 then the next number in the sequence is 109
The next number in the sequence is 27.
Ten.