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If you don't recognize the sequence: "6, 28, 496, 8128," don't waste your time trying to figure this one out! (There's at least an hour of my life I'll never get back...)
"14, 23, 28, 33, 42" - _NOT_ outside the box!
The author of the site thought he was being clever with this one, but I beat him! The +2 / -2 is the key...