21st Century – Current Claimed World Record
In August 2009, a Japanese Supercomputer called the T2K Open Supercomputer was claimed to have more than doubled the previous record by calculating pi to 2.6 trillion digits in approximately 73 hours and 36 minutes.
In December 2009, Fabrice Bellard used a home computer to compute 2.7 trillion decimal digits of pi. Calculations were performed in base 2 (binary), then the result was converted to base 10 (decimal). The calculation, conversion, and verification steps took a total of 131 days.
In August 2010, Shigeru Kondo used Alexander Yee's y-cruncher to calculate 5 trillion digits of pi. This was the world record for any type of calculation, but significantly it was performed on a home computer built by Kondo. The calculation was done between May 4 and August 3, with the primary and secondary verifications taking 64 and 66 hours respectively. In October 2011, they then broke their own record by correctly computing ten trillion (1013) and fifty digits using the same method but with better hardware.
Read more about this topic: Approximations Of π
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