In the machine
aryabhata
pi = 4/1 - 4/3 + 4/5 - 4/7 ...
the current record for decimal places that pi has been calculated to is 1,241,100,000,000 THIS IS MORE THAN A TRILLION * * * * * As of 17 October 2011, the answer is 10 trillion.
"Not as a decimal or fraction as there are an infinite number of digits." This is a common and useful answer. The *correct* answer is that PI is firstly an irrational number that cannot be calculated from any ratio (fraction). Secondly, PI is a transcendental number that, by the definition of "transcendental", cannot be exactly calculated. The nest you can do is to apply an infinite convergent series that becomes more and more accurate with more and more decimal places.
D. Takahasi and Y. Kanada
The computer was HITACHI SR2201. But in 1999, they calculated even more decimal places (206,158,430,000) with the HITACHI SR8000.
In the machine
It was at the Computer Centre at the University of Tokyo. Of course, their record has now been smashed. In October 2011, pi was calculated to almost 200 times as many digits: 10 trillion (and 50).
The computer was a HITACHI SR2201, and in 1999 i think they used a HITACHI SR8000 or a SR800 i cant remember tho.
Dr. Daisuke Takahashi and Yasumasa Kanada did their analysis of PIat the University of Tokyo, in 1997.Computer Centre, University of TokyoBunkyo-ku Yayoi 2-11-16Tokyo 113 Japanhttp://www.cecm.sfu.ca/~jborwein/Kanada_50b.htmlh
The computer was HITACHI SR 2201
As of April 1999, 68.7 billion places had been calculated. As of September 1999, 206 billion places had been calculated.
Japanese mathematician Yasumasa Kanada, who computed trillions of digits for pi, is an IT professor at the University of Tokyo.
In April 1999, Yasumasa Kanada and Daisuke Takahashi calculated pi to 68.7 billion places. In September 1999 they improved that to just over 206 billion.The current record (in May 2016) is 13.3 trillion.
they used a HITACHI SR 2201
Professor Yasumasa Kanada and a team of researchers set a new world record by calculating the value of pi to 1.24 trillion places, project team member Makoto Kudo said yesterday. The previous record, set by Kanada in 1999, was 206.158 billion places. This record (above) has been superceeded as algorithms and computational speeds continue to improve On August 17, 2009, Daisuke Takahashi announced that his team had calculated pi to 2.577 trillion places On December 31, 2009, Fabrice Bellard announce he had calculated pi to about 2.700 trillion places.