You almost can't not pick 117.
Try it, ask people who never heard of the game Halo. And 90% of them will still pick 117. It's just unavoidable.
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I was going to say: 468.1415292375624950245056823143 Oh, you meant an [i]integer[/i] between 0 and 1000. Honestly the most memorable number between 0 and 1000 would have to be 42.