The sequence interval is 2 4 6 8 ( this is the difference of number). so the missing number is -1 if I'm not mistaken.
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29
17, 19, 23, 29, and 31
If you mean: 41, 29, 35 and 23 then they are all prime numbers except for 35 which is a composite number.
17, 19, 23, 29, and 31
-47, -41, -35, -29, -23, -17, -11, -5, 1, etc.