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You need to go to the site to do the puzzle. How many of you can figure it out and let us know how long
Cheater's find the answer here: The numbers must count up
I got it on the 2nd entry w/ no wrongs but I did have to enter 1 test that I thought would come up false just to be sure. At first it seems like it's doubled, then it seems like maybe it's evens but when you plug in an odd and it works you realize the order is the issue.