تسلسل زمني لحساب ط
عصر الحواسيب الإلكترونية (منذ 1949)

| التاريخ | من | كيف ؟ | الوقت | عدد الرتب العشرية (الأرقام القياسية مضغوطة) |
| --- | --- | --- | --- | --- |
All records from 1949 onwards were calculated with electronic computers.: All records from 1949 onwards were calculated with electronic computers.
| 1949 | جون رنش, and L. R. Smith | Were the first to use an electronic computer (the إينياك) to calculate π (also attributed to Reitwiesner et al.)  | 70 ساعة | 2,037 |
| 1953 | كورت ماهلر | Showed that π is not a عدد ليوفيل |  |  |
| 1954 | S. C. Nicholson & J. Jeenel | Using the NORC  | 13 دقيقة | 3,093 |
| 1957 | George E. Felton | فيرانتي Pegasus computer  ‏ (London), calculated 10,021 digits, but not all were correct  |  | 7,480 |
| يناير 1958 | Francois Genuys | IBM 704  | 1.7 ساعة | 10,000 |
| May 1958 | George E. Felton | Pegasus computer (London) | 33 ساعة | 10,021 |
| 1959 | Francois Genuys | IBM 704 (Paris) | 4.3 ساعة | 16,167 |
| 1961 | Daniel Shanks and جون رنش | IBM 7090 (New York) | 8.7 ساعة | 100,265 |
| 1961 | J.M. Gerard | IBM 7090 (London) | 39 دقيقة | 20,000 |
| 1966 | Jean Guilloud and J. Filliatre | IBM 7030 (Paris) | 28 ساعة  | 250,000 |
| 1967 | Jean Guilloud and M. Dichampt | سي دي سي 6600 (Paris) | 28 ساعة | 500,000 |
| 1973 | Jean Guilloud and Martin Bouyer | CDC 7600 | 23.3 ساعة | 1,001,250 |
| 1981 | Kazunori Miyoshi and ياسوماسا كانادا | FACOM M-200 |  | 2,000,036 |
| 1981 | Jean Guilloud | Not known |  | 2,000,050 |
| 1982 | Yoshiaki Tamura | MELCOM 900II |  | 2,097,144 |
| 1982 | Yoshiaki Tamura and ياسوماسا كانادا | HITAC M-280H | 2.9 ساعة | 4,194,288 |
| 1982 | Yoshiaki Tamura and ياسوماسا كانادا | HITAC M-280H |  | 8,388,576 |
| 1983 | ياسوماسا كانادا, Sayaka Yoshino and Yoshiaki Tamura | HITAC M-280H |  | 16,777,206 |
| October 1983 | Yasunori Ushiro and ياسوماسا كانادا | HITAC S-810/20  ‏ |  | 10,013,395 |
| October 1985 | Bill Gosper | Symbolics 3670 |  | 17,526,200 |
| يناير 1986 | ديفيد اتش بيلي | CRAY-2 |  | 29,360,111 |
| September 1986 | ياسوماسا كانادا، Yoshiaki Tamura | HITAC S-810/20  ‏ |  | 33,554,414 |
| October 1986 | ياسوماسا كانادا، Yoshiaki Tamura | HITAC S-810/20  ‏ |  | 67,108,839 |
| يناير 1987 | ياسوماسا كانادا، Yoshiaki Tamura، Yoshinobu Kubo and others | NEC SX-2 |  | 134,214,700 |
| يناير 1988 | ياسوماسا كانادا and Yoshiaki Tamura | HITAC S-820/80  ‏ |  | 201,326,551 |
| May 1989 | الأخوان شودنوفسكي | CRAY-2 & IBM 3090/VF |  | 480,000,000 |
| June 1989 | الأخوان شودنوفسكي | IBM 3090 |  | 535,339,270 |
| July 1989 | ياسوماسا كانادا and Yoshiaki Tamura | HITAC S-820/80  ‏ |  | 536,870,898 |
| August 1989 | الأخوان شودنوفسكي | IBM 3090 |  | 1,011,196,691 |
| 19 November 1989 | ياسوماسا كانادا and Yoshiaki Tamura | HITAC S-820/80  ‏ |  | 1,073,740,799 |
| August 1991 | الأخوان شودنوفسكي | Homemade parallel computer (details unknown, not verified)  |  | 2,260,000,000 |
| 18 May 1994 | الأخوان شودنوفسكي | New homemade parallel computer (details unknown, not verified) |  | 4,044,000,000 |
| 26 June 1995 | ياسوماسا كانادا and Daisuke Takahashi  ‏ | HITAC S-3800/480  ‏ (dual CPU)  |  | 3,221,220,000 |
| 1995 | سيمون بلوف | Finds a صيغة بايلي-بورفاين-بلوف that allows the nth hexadecimal digit of pi to be calculated without calculating the preceding digits. |  |  |
| 28 August 1995 | ياسوماسا كانادا and Daisuke Takahashi  ‏ | HITAC S-3800/480  ‏ (dual CPU)  |  | 4,294,960,000 |
| 11 October 1995 | ياسوماسا كانادا and Daisuke Takahashi  ‏ | HITAC S-3800/480  ‏ (dual CPU)  |  | 6,442,450,000 |
| 6 July 1997 | ياسوماسا كانادا and Daisuke Takahashi  ‏ | HITACHI SR2201 (1024 CPU)  |  | 51,539,600,000 |
| 5 April 1999 | ياسوماسا كانادا and Daisuke Takahashi  ‏ | HITACHI SR8000 (64 of 128 nodes)  |  | 68,719,470,000 |
| 20 September 1999 | ياسوماسا كانادا and Daisuke Takahashi  ‏ | HITACHI SR8000/MPP (128 nodes)  |  | 206,158,430,000 |
| 24 November 2002 | ياسوماسا كانادا & 9 man team | HITACHI SR8000/MPP (64 nodes), Department of Information Science at the جامعة طوكيو in طوكيو، اليابان  | 600 ساعة | 1,241,100,000,000 |
| 29 April 2009 | Daisuke Takahashi  ‏ et al. | T2K Open Supercomputer (640 nodes), single node speed is 147.2 فلوبس, computer memory is 13.5 تيرابايت، خوارزمية غاوس-ليجاندر  ‏, Center for Computational Sciences at the جامعة تسوكوبا in تسوكوبا، اليابان | 29.09 ساعة | 2,576,980,377,524 |
| متى ؟ | من ؟ | كيف ؟ | مدة الحساب | Decimal places  (رقم عالميs in bold)  |
| --- | --- | --- | --- | --- |
All records from Dec 2009 onwards are calculated on home computers with commercially available parts.: All records from Dec 2009 onwards are calculated on home computers with commercially available parts.
| 31 دسمبر 2009 | فابريس بيلارد |  Core i7 CPU at 2.93 GHz  6 GiB (1) of RAM  7.5 TB of disk storage using five 1.5 TB hard disks (Seagate Barracuda 7200.11 model)  64 bit Red Hat Fedora 10 distribution  Computation of the binary digits: 103 days  Verification of the binary digits: 13 days  Conversion to base 10: 12 days  Verification of the conversion: 3 days  Verification of the binary digits used a network of 9 Desktop PCs during 34 hours, Chudnovsky algorithm, see  for Bellard's homepage. | 131 days | 2,699,999,990,000 |
| 2 August 2010 | Shigeru Kondo |  using y-cruncher by Alexander Yee  the Chudnovsky algorithm was used for main computation  verification used the Bellard & Plouffe formulas on different computers, both computed 32 hexadecimal digits ending with the 4,152,410,118,610th.  with 2 x Intel Xeon X5680 @ 3.33 GHz – (12 physical cores, 24 hyperthreaded)  96 GB DDR3 @ 1066 MHz – (12 × 8 GB – 6 channels) – Samsung (M393B1K70BH1)  1 TB SATA II (Boot drive) – Hitachi (HDS721010CLA332), 3 × 2 TB SATA II (Store Pi Output) – Seagate (ST32000542AS) 16 x 2 TB SATA II (Computation) – Seagate (ST32000641AS)  Windows Server 2008 R2 Enterprise x64  Computation of binary digits: 80 days  Conversion to base 10: 8.2 days  Verification of the conversion: 45.6 hours  Verification of the binary digits: 64 hours (primary), 66 hours (secondary)  Verification of the binary digits were done simultaneously on two separate computers during the main computation. | 90 days | 5,000,000,000,000 |
| 17 October 2011 | Shigeru Kondo |  using y-cruncher by Alexander Yee  Verification: 1.86 days and 4.94 days | 371 days | 10,000,000,000,050 |
| 28 دسمبر 2013 | Shigeru Kondo |  using y-cruncher by Alexander Yee  with 2 x Intel Xeon E5-2690 @ 2.9 GHz – (16 physical cores, 32 hyperthreaded)  128 GB DDR3 @ 1600 MHz – 8 x 16 GB – 8 channels  Windows Server 2012 x64  Verification: 46 hours | 94 days | 12,100,000,000,050 |
| 8 October 2014 | "houkouonchi" |  using y-cruncher by Alexander Yee  with 2 x Xeon E5-4650L @ 2.6 GHz  192 GB DDR3 @ 1333 MHz  24 x 4 TB + 30 x 3 TB  Verification: 182 hours | 208 days | 13,300,000,000,000 |
| 11 November 2016 | Peter Trueb |  using y-cruncher by Alexander Yee  with 4 x Xeon E7-8890 v3 @ 2.50 GHz (72 cores, 144 threads)  1.25 TB DDR4  20 x 6 TB  Verification: 28 hours | 105 days | 22,459,157,718,361 |