They said”there’s no pattern in this puzzle”, what makes you think that there’s a formula based in math that can get the key, even if it was created by math/method?
Haven't you heard, he's jump scanning the range (or is it range jumping the scan), because, well... mathematics. You know, for the same reason lottery numbers are totally predictable, because mathematics. I think he's waiting for another 1000 or so prefixes to help him, since initially his math told him there are only 4 of them, because "mathematics" again. Then the other guy that helps him wants to BSGS his way through the addresses, so I guess it's actually a very solid baby scan giant jump through the hashes, or something like that. Wait, grab my popcorn...