Babylonians 2000? BCE 1 3.125 = 3 + 1/8 Egyptians 2000? BCE 1 3.16045 China 1200? BCE 1 3 Bible (1 Kings 7:23) 550? BCE 1 3 Archimedes 250? BCE 3 3.1418 (ave.) Hon Han Shu 130 AD 1 3.1622 = sqrt(10) ? Ptolemy 150 3 3.14166 Chung Hing 250? 1 3.16227 = sqrt(10) Wang Fau 250? 1 3.15555 = 142/45 Liu Hui 263 5 3.14159 Siddhanta 380 3 3.1416 Tsu Ch'ung Chi 480? 7 3.1415926 Aryabhata 499 4 3.14156 Brahmagupta 640? 1 3.162277 = sqrt(10) Al-Khowarizmi 800 4 3.1416 Fibonacci 1220 3 3.141818 Al-Kashi 1429 14 Otho 1573 6 3.1415929 Viete 1593 9 3.1415926536 (ave.) Romanus 1593 15 Van Ceulen 1596 20 Van Ceulen 1615 35 Newton 1665 16 Sharp 1699 71 Seki 1700? 10 Kamata 1730? 25 Machin 1706 100 De Lagny 1719 127 (112 correct) Takebe 1723 41 Matsunaga 1739 50 Vega 1794 140 Rutherford 1824 208 (152 correct) Strassnitzky and Dase 1844 200 Clausen 1847 248 Lehmann 1853 261 Rutherford 1853 440 Shanks 1874 707 (527 correct)
Ferguson 1946 620 Ferguson Jan. 1947 710 Ferguson and Wrench Sep. 1947 808 Smith and Wrench 1949 1,120 Reitwiesner et al. (ENIAC) 1949 2,037 Nicholson and Jeenel 1954 3,092 Felton 1957 7,480 Genuys Jan. 1958 10,000 Felton May 1958 10,021 Guilloud 1959 16,167 Shanks and Wrench 1961 100,265 Guilloud and Filliatre 1966 250,000 Guilloud and Dichampt 1967 500,000 Guilloud and Bouyer 1973 1,001,250 Miyoshi and Kanada 1981 2,000,036 Guilloud 1982 2,000,050 Tamura 1982 2,097,144 Tamura and Kanada 1982 4,194,288 Tamura and Kanada 1982 8,388,576 Kanada, Yoshino and Tamura 1982 16,777,206 Ushiro and Kanada Oct. 1983 10,013,395 Gosper 1985 17,526,200 Bailey Jan. 1986 29,360,111 Kanada and Tamura Sep. 1986 33,554,414 Kanada and Tamura Oct. 1986 67,108,839 Kanada, Tamura, Kubo et al Jan. 1987 134,217,700 Kanada and Tamura Jan. 1988 201,326,551 Chudnovskys May 1989 480,000,000 Chudnovskys Jun. 1989 525,229,270 Kanada and Tamura Jul. 1989 536,870,898 Kanada and Tamura Nov. 1989 1,073,741,799 Chudnovskys Aug. 1989 1,011,196,691 Chudnovskys Aug. 1991 2,260,000,000 Chudnovskys May 1994 4,044,000,000 Takahashi and Kanada Jun. 1995 3,221,225,466 Takahashi and Kanada Aug. 1995 4,294,967,286 Takahashi and Kanada Oct. 1995 6,442,450,938
Bailey, Borwein, Plouffe Nov. 1995 40,000,000,000 (hexa 921C73C6838FB2) Bellard Jul. 1996 200,000,000,000 (hexa 1A10A49B3E2B82A4404F9193AD4EB6) Bellard Oct. 1996 400,000,000,000 (hexa 9C381872D27596F81D0E48B95A6C46)