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xkcd #2937: Room Code
(imgs.xkcd.com)
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I do these all the time.
This one is a bit trickier than usual but thinking 2, 5 and a number that adds up to 8.
02 + 05 + ? = 8
The sequence of 2, 5, 8 is also very nice since you get the subsequent numbers by adding 3s
Oh man, there's more than one of us