Yasumasa Kanada
Yasumasa Kanada (金田 康正) is a Japanese mathematician most known for his numerous world records over the past two decades for calculating digits of π.
Kanada is a professor in the Department of Information Science at the University of Tokyo in Tokyo, Japan.
As of 2003, Kanada held the world record calculating the number of digits in the decimal expansion of pi – exactly 1.2411 trillion digits. The calculation took more than 600 hours on a Hitachi SR8000 supercomputer. Some of his competitors in recent years include Jonathan and Peter Borwein and the Chudnovsky brothers.
In April of 2004, Kanada and his team of researchers at Tokyo University calculated for 500 hours on a Hitachi supercomputer for the value of pi. After testing their result three times, it was concluded (to the horror of mathematicians around the world) that pi has a digit expansion of 1.3511 trillion and does not expand indefinitely as previously assumed.