2007-12-29, 18:41 | #1 |
Aug 2002
3·5^{2}·7 Posts |
PrimeGrid has found the 13th Largest Known Prime!
13 938237*2^3752950-1 1129757 L521 2007 Woodall
http://primes.utm.edu/primes/page.php?id=83407 This is the largest non Gimps non SB prime in the top 20 list. At number 15 we find the 123 project, and at number 18 we find the PSP project. Numbers 18 and 19 are Generalized Fermat. Woodall Prime Search Woodall Numbers are positive integers of the form Wn = n * 2^n - 1, where n is also a positive integer greater than zero. It is conjectured that there are infinitely many such primes. The Woodall numbers Wn are primes for n=2, 3, 6, 30, 75, 81, 115, 123, 249, 362, 384, 462, 512, 751, 822, 5312, 7755, 9531, 12379, 15822, 18885, 22971, 23005, 98726, 143018, 151023, 22971, ... 2013992, 2367906 and composite for all other n less than 2,367,906. So this is W3752948 ie 3752948*2^3752948 -1 |
Thread Tools | |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Largest k*2^n-1 Primes Found in 2012 | Kosmaj | Riesel Prime Search | 3 | 2013-12-27 13:25 |
New largest prime number found | Prime95 | Miscellaneous Math | 20 | 2008-07-29 16:58 |
formula for largest prime found | debasish | Miscellaneous Math | 20 | 2007-09-28 03:48 |
Largest prime found yet by 15k search | TTn | 15k Search | 1 | 2004-05-11 03:04 |
need Pentium 4s for 5th largest prime search (largest proth) | wfgarnett3 | Lounge | 7 | 2002-11-25 06:34 |