The only numbers were 12, -14, and 4 I believe, and there was only one of each. The numbers did not despawn, so no matter where I went I would eventually run into them again. No other numbers ever showed up.
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I believe I shot the numbers, but I'm not 100% certain.
Edit: I got it to happen again, this time there were only two numbers, 4 and 16. Right before I was left with just those two I saw some other numbers spawn in but they were all moving away from me. Maybe something's happening to the pathfinding?