# Simon Plouffe

**Simon Plouffe** (born June 11, 1956 in Saint-Jovite , Québec ) is a Canadian mathematician .

Plouffe discovered 1995, the *BBP algorithm* underlying formula (the Bailey-Borwein-Plouffe formula ) showing the extraction of the *n* th digit of the binary expansion of the circle number allows π. Plouffe is also a co-author of the *Encyclopedia of Integer Sequences* , which became an On-Line Encyclopedia of Integer Sequences in 1995 . In 1996, Plouffe discovered an algorithm for computing π in arbitrary bases . Until 2012, *Plouffe's Inverter* was a website that listed over 200 million mathematical constants and made it possible to find the corresponding mathematical definition from the sequence of their first decimal digits. The *Inverse Symbolic Calculator Plus* website offers some substitute .

Both online number checkers are based on the Inverse Symbolic Calculator that Peter and Jonathan Borwein set up together with Simon Plouffe at Simon Fraser University in the late 1990s .

## Web links

- Page maison / Homepage (French and English)
- Plouffe's Inverter (2015 no longer online)
- Encyclopedia of Integer Sequences
- Original Inverse Symbolic Calculator
- Inverse Symbolic Calculator Plus (as of 2015)

## Individual evidence

- ^ John Conway , Richard K. Guy : Zahlenzauber (The Book of Numbers) . 1st edition. Birkhäuser, 1997, ISBN 3-7643-5244-2 , p. 30-31 .

personal data | |
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SURNAME | Plouffe, Simon |

BRIEF DESCRIPTION | Canadian mathematician |

DATE OF BIRTH | June 11, 1956 |

PLACE OF BIRTH | Saint-Jovite , Quebec |