The BBP (named after Bailey-Borwein-Plouffe) is a formula for calculating π discovered by Simon Plouffe in 1995,
π=∞∑n=0(48n+1-28n+4-18n+5-18n+6)(116)n.
Amazingly, this formula is a digit-extraction algorithm for π in base 16.
Following the discovery of this and related formulas, similar formulas in other bases were investigated. This class of formulas are now known as BBP-type formulas.
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