In the year 1997 d takahashi and y kanada calculated pi to 51,539,600,000 decimal places. what type of computer did they use? where did they do the calculations

Takahashi and Kanada did their work on the digits of pi at the University of Tokyo in what is called the Computer Center. They developed a computer algorithm (a set of steps/procedure) that delivered the digits in 29 hours and 7 minutes.

They used a computer called the HITACHI SR2201 which has 1024 processors. As an example most desktops in use now (by individuals such as you and I -- not by computer scientists doing research) have 1-2 processors with 2 cores each.