This looks very much like the prime numbers; numbers that can only be divided by themselves and 1.
The continuation of your series is: 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71 ... and so on.
17?
17
you are adding 2, so its 17
These are all prime numbers. The next one is 17
15? ================= I'm guessing this is a list of the prime numbers? So the next number would be 17.
-13
17
Actually the next number in the sequence is 17 A 19 , 23 , 29 , 31 ,.......... Prim number
17 cause it is the next prime number
17?
17
you are adding 2, so its 17
These are all prime numbers. The next one is 17
7 is a prime number followed by 11 13 17 19 23 ... etc
17, it's the sequence of primes.
13
The are 11, 17 and 24.