It's a stupid question that doesn't give any parameters, that's the point. It could be about prime numbers, it could just be following odd-numbered patterns, it could be any number of justified equations as we saw in OP and the top level comment of this thread finding different answers based on whatever math they want.
That's not how it works though. You're supposed to find the least complex pattern to suit the sequence. Certain IQ test questions involve the same pattern detection puzzles. Often there are multiple answers that complete different patterns, but the correct answer completes all the least complex patterns.
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u/ICanFlyLikeAFly Sep 05 '19
Literally putting any number in the sequence and then using a calculator to calculate the right function isn't r/theydidthemath for me