<Tr> <Td> August 1991 </Td> <Td> Gregory V. Chudnovsky & David V. Chudnovsky </Td> <Td> Homemade parallel computer (details unknown, not verified) </Td> <Td> </Td> <Td> 2,260,000,000 </Td> </Tr> <Tr> <Td> 18 May 1994 </Td> <Td> Gregory V. Chudnovsky & David V. Chudnovsky </Td> <Td> New homemade parallel computer (details unknown, not verified) </Td> <Td> </Td> <Td> 4,044,000,000 </Td> </Tr> <Tr> <Td> 26 June 1995 </Td> <Td> Yasumasa Kanada and Daisuke Takahashi </Td> <Td> HITAC S - 3800 / 480 (dual CPU) </Td> <Td> </Td> <Td> 3,221,220,000 </Td> </Tr> <Tr> <Td> 1995 </Td> <Td> Simon Plouffe </Td> <Td> Finds a formula that allows the n th hexadecimal digit of pi to be calculated without calculating the preceding digits . </Td> <Td> </Td> <Td> </Td> </Tr>

When did humankind start to calculate pi or make records of it