Wisdom of Crowds Experiment-2

This time I would prefer a bit more complex question. It could actually be placed in an IQ test.

I am only trying different fields where wisdom of crowds would be successful. Is that a universal phenomenon, or it only works for linear simple problems?

Therefore, please answer the following question in the poll:

What is the missing number in the sequence:

1, 3, 7, ?, 31

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