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The Really Big Ass Number function is defined as $$\mathrm{rban}(n) = n^{n \uparrow\uparrow\uparrow n}$$ (n to the power of n pentated to n).[1] It was invented by Matt Leach along with the Big Ass Number function in an attempt to create an uncomputable function. In reality, the function is only on par with $$f_4(n)$$ in the fast-growing hierarchy, and is definitely computable. In fact, it's primitive recursive.

### Sources Edit

1. Really Big Numbers