In "nβth digit of π and π^n" are both n the same? In other words, for say π^50 does the formula only give me the 50th digit, or does it give me any arbitrary digit I want?
Yes.
> In other words, for say π^50 does the formula only give me the 50th digit
Yes.
> or does it give me any arbitrary digit I want?
It gives you the n-th digit of \pi^n. Here n is arbitrary.