you are adding 2, so its 17
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What would be the next number in this series 15 12 13 10 11 8?
17
The pattern is - 5 then +2. 2 and 4 are the next numbers in the series.
2 3 5 7 11 13 17 19 23 29 31 They are prime numbers.
This looks like a (subtract 5; add 2) series, so the next numbers are: 2, 4, -1, 1