2 3 5 7 11 13 17 19 23 ... Prime numbers
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If you mean: 12, 11, 9, 6, 2 then the next number is -3 Because they are being reduced by 1, 2, 3, 4 and then 5
17 cause it is the next prime number
11
14
It seems that ecah number is obtained by squaring the previous number, then adding 2.