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I've seen that implemented in the facebook graph, for example if you will look for "people who likes php" and start scrolling down, for each new "batch" of people a new request will be generated with those numbers. That's why i assumed it was a formula/algorithm implemented, because it was generated at scrolldown.

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I don't use FB, so I've never seen anything of that ilk, but I would assume it was just sequential, but interleaved with other results or terms that you don't see. Something, somewhere might be generating unique terms and handing them out to whomever asks for them. Your requests get some, someone else's requests get others, there's no specific and simply rule for the ones you see. That sort of thing.

Just a guess, probably completely wrong in detail, but it's the sort of thing I can imagine happening. I wouldn't expect the sequence you give to have any real "formula" underneath.

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