There could be two alternating series blended into one.
2....3....6......where the terms are formed by the addition of increasing odd numbers
...6....8....12.where the terms are formed by the addition of increasing even numbers
Then the next number would be 6 + 5 = 11.
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11.
9
12 / 5 = 2 with a remainder of 2. So 12/5 as a mixed number is 2 2/5
Let the number be x and so the expression is: 12+x/2
number factors for :12=2*2*318=2*3*326=2*13