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Розподілені обчислення в Україні > Завершені проекти > Математика (завершені проекти) > Multifactorial PrimesОстанні 10 повідомлень [ в зворотному порядку ]
| nikelong | Дата Mar 9 2009, 13:56 |
| Join the Search for Multifactorial Primes. This project continues work started by Ray Ballinger to find multifactorial prime numbers, primes of the form n!!+/-1, n!!!+/-1, n!!!!+/-1, searching for all primes up to 10,000 digits for each multifactorial type. The project has recently proven the following numbers are prime: Number Digits Date 229204!24 + 1 47,047 February 21, 2006 227194!24 + 1 46,598 February 21, 2006 226208!24 + 1 46,378 February 21, 2006 164892!11 + 1 71,700 March 19, 2006 80069!3 + 1 119,284 March 31, 2006 127284!7 + 1 84,929 October 31, 2007 221378!25 + 1 43,489 December 29, 2007 142780!7 + 1 96,285 January 23, 2008 215387!23 + 1 45,880 January 25, 2008 235349!25 + 1 46,484 January 30, 2008 On March 29, 2005, the project finished !19 to 200,000. On May 31, 2005, the project finished !17 + 1 to 170,000. On August 6, 2005, the project finished !17 - 1 to 170,000. On August 21, 2005, the project finished !25 to 200,000. On September 9, 2005, the project finished !15 to 130,000. On November 26, 2005, the project finished !15 to 150,000. On November 26, 2005, the project tested all types up to 20 to 10,000 * type +/- 1. On December 20, 2005, the project finished !3 + 1 to 75,000. On February 28, 2006, the project finished !24 + 1 to 240,000. On March 27, 2008, the project finished !25 + 1 to 250,000. Participation instructions are at the top of the project page. Basically, you email the project coordinator to reserve a type, then use the multisieve and pfgw Windows applications to sieve the range and find primes in it, then submit your results to the project coordinator. |
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| Death | Дата Feb 10 2009, 13:48 |
| http://primes.utm.edu/glossary/page.php?so...ifactorialPrime n!! = n!2 n!!! = n!3 n!k+-1 - мультифакторное простое число. |
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| nikelong | Дата Feb 9 2009, 20:51 |
| Multifactorial Primes http://www.geocities.com/kradenken/index.html http://www.rechenkraft.net/wiki/index.php?...actorial_Primes |
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