Which number comes next in this series 123 567 9?

Answer 1

Often when given only a few numbers in a sequence or series, there is more than one possible answer.

As a sequence, this could be the numbers NOT divisible by 4. In this case the sequence is 1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 15, 17, 18, 19, 21, 22, 23, 25, 26, 27, 29, 30, 31, 33, 34, 35, 37, 38, 39, 41,...

The sequence could be: all numbers n such that 2n + 9 is prime, or it could be all numbers n such that 30(n)+13 is prime, just to name a few.