15 19
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67, 131, and 259.
1 squared, 2 squared, 3 squared etc so the next 3 terms are 36,49 and 64.
multiply 3 subtract 2
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
-11