17th August 2009 Our latest record was established as the followings; Declared record: 2,576,980,370,000 decimal digits Two independent calculation based on two different algorithms generated 2,576,980,377,600 (=75*2^35) decimal digits of pi and comparison of two generated sequences matched up to 2,576,980,377,524 decimal digits, e.g., 76 decimal digits difference. Then we are declaring 2,576,980,370,000 decimal digits as the new world record. Main program run: Job start : 9th April 2009 07:37:32 (JST) Job end : 10th April 2009 12:43:21 (JST) Elapsed time : 29:05:49 Main memory : 13.5 TB Algorithm : Gauss-Legendre algorithm Verification program run: Job start : 27th April 2009 21:35:36 (JST) Job end : 29th April 2009 18:06:09 (JST) Elapsed time : 44:30:33 Main memory : 12.9 TB Algorithm : Borwein's 4-th order convergent algorithm 2,500,000,000,000-th digits of pi and 1/pi: pi : 7023378492 4587524911 1838622539 0987058051 8718886518 1/pi: 0010432844 0001483439 6158108827 4408637842 1609987750 ^ 2,500,000,000,000-th (First digit '3' for pi or '0' for 1/pi is not included in the above count.) Frequency distribution for pi-3 up to 2,500,000,000,000 decimal places: '0' : 249999192826; '1' : 249999959334; '2' : 250000751269; '3' : 249999904969; '4' : 250000455856; '5' : 249999721513; '6' : 249999564178; '7' : 249999660121; '8' : 250001040584; '9' : 249999749350; Chi-square = 11.85 Frequency distribution for 1/pi up to 2,500,000,000,000 decimal places: '0' : 249999622924; '1' : 250000603011; '2' : 249999024748; '3' : 249999886945; '4' : 250000566113; '5' : 250000389148; '6' : 250000066227; '7' : 249999751301; '8' : 250000370807; '9' : 249999718776; Chi-square = 8.90 2,576,980,370,000-th digits of pi and 1/pi: pi : 3616276346 5152343138 0598550567 3249553206 9855284552 1/pi: 1787760186 8492477551 0458174294 3077949861 4582392945 ^ 2,576,980,370,000-th (First digit '3' for pi or '0' for 1/pi is not included in the above count.) Some of interesting digits sequences; 012345678901 : from 1,781,514,067,534-th of pi 012345678901 : from 2,364,190,386,673-th of pi 987654321098 : from 593,100,546,152-th of pi 987654321098 : from 1,116,106,038,318-th of pi 8888888888888 : from 2,164,164,669,332-th of pi 271828182845 : from 1,016,065,419,627-th of pi 271828182845 : from 1,535,917,328,677-th of pi 314159265358 : from 1,142,905,318,634-th of pi 012345678901 : from 800,507,066,497-th of 1/pi 012345678901 : from 1,266,229,196,919-th of 1/pi 012345678901 : from 1,473,016,373,015-th of 1/pi 012345678901 : from 1,816,975,999,322-th of 1/pi 987654321098 : from 459,580,193,751-th of 1/pi 987654321098 : from 865,156,153,180-th of 1/pi 987654321098 : from 2,392,385,170,607-th of 1/pi 3333333333333 : from 55,172,085,586-th of 1/pi 4444444444444 : from 917,885,346,865-th of 1/pi 4444444444444 : from 1,828,219,364,949-th of 1/pi 271828182845 : from 1,400,850,126,381-th of 1/pi 3141592653589 : from 1,801,642,919,402-th of 1/pi (First digit '3' for pi or '0' for 1/pi is not included in the above count.) Programs were written by myself. The computer used was T2K Open Supercomputer (Appro Xtreme-X3 Server) at the Center for Computational Sciences, University of Tsukuba. 640 nodes of the total system (648 nodes, theoretical peak processing speed for the single node is 147.2 billion floating point operations per second. 95.4 trillion floating point operations per second for all nodes), were definitely used as single job and parallel processing for both of programs run. Daisuke Takahashi Graduate School of Systems and Information Engineering University of Tsukuba 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan E-mail: daisuke[at]cs.tsukuba.ac.jp