Bellard's formula
http://en.wikipedia.org/wiki/Bellard%27s_formula
算pi最快
Bellard's formula, as used by PiHex, the now-completed distributed computing project, is used to calculate the nth digit of π in base 2. It is a faster version (about 43% faster[1]) of the Bailey–Borwein–Plouffe formula. Bellard's formula was discovered by Fabrice Bellard in 1997.
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