One for the math nerds.

[Occhidiangela]

Though it doesn't work for base 10, there is an exact formula for the digits of pi in heaxadecimal bases, like 16: see, for example:

http://www.sciencenews.org/pages/sn_arc98/...98/mathland.htm
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From the article:

Nonetheless, there's no evidence yet that an efficient algorithm for computing isolated decimal digits of pi doesn't exist.

Other than the appaarent fact that no one has discovered it yet, this most Omnipotent algorithm? The Primal algorithm, perhaps? ;)

Occhi