Thought it would be fun to have a thread for IQ puzzles to solve for the intellectuals among us. Once you have solved a puzzle and it has been confirmed as solved. You can then provide your own puzzle. This can either be a puzzle you've created yourself or one that you have came across in an IQ test or something similar. (Make sure the solution isn't easy to search for online!)
I'll get the ball rolling with this number sequence I came up with.
Replace the question mark with the appropriate value in the following sequence:
1 - 3 - 5 - 9 - ? - 27 - 13
Good luck!