The **Bailey-Borwein-Plouffe formula** (**BBP formula**) provides a spigot algorithm for the computation of the nth digit of . The original BBP** ** summation formula was found in 1995 by Plouffe using PSLQ. It is

Amazingly, this formula is a digit-extraction algorithm for in base 16.

It appears that there is a digit extraction algorithm even for e!

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