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The arrows you mean? https://en.wikipedia.org/wiki/Knuth%27s_up-arrow_notation
For most people it comes under the realm of "maths trivia" because it's never practically useful. You wouldn't have seen it before unless you hang around with maths nerds or read about maths for fun. So I wouldn't feel stupid if I were you.
Graham's number is a fucking massive number that is an upper bound/maximum on the answer to some question about colouring.
frankenbike
gbj_tester
I literally have no idea what any of that means. I feel a bit stupid.