20081016, 14:53  #1 
Mar 2007
Austria
2·151 Posts 
Other primes thread
I think I'm starting a thread like in RPS here for nonriesel primes found by NPLB members/special riesel primes found by others.
nuggetprime 
20081016, 14:56  #2 
Mar 2007
Austria
2×151 Posts 
First prime
Found 6th largest Generalized Woodall Prime:
91850*19^918501 is prime! This is one of only 3 top5000 primes found by phil's phrot and the first bigger/top5000 discovery for Geoff's phrot port for linux. nuggetprime 
20081016, 20:12  #3  
May 2007
Kansas; USA
10100010100011_{2} Posts 
Quote:
Great idea nugget! VERY nice find! It's nice to see primes discovered in other bases. 

20081025, 08:37  #4 
Mar 2007
Austria
456_{8} Posts 
Nearly breaking Kosmaj's GW record:
146478*19^1464781 is prime!(187315 digits) Now 2nd largest GW. nuggetprime 
20081107, 17:26  #5 
Mar 2007
Austria
2·151 Posts 
The new world record
As you may have already noticed, a few days ago I found the largest known GW prime:
189620*19^1896201 is prime!(242483 digits) nuggetprime Last fiddled with by nuggetprime on 20081107 at 17:26 
20081108, 09:07  #6 
May 2007
Kansas; USA
101×103 Posts 

20081119, 13:26  #7 
Sep 2004
2·5·283 Posts 

20081119, 14:53  #8  
May 2007
Kansas; USA
101×103 Posts 
Quote:
So THAT is where Benson has been at all this time! I guess for a score of 423, it was worth it. That equals about 100 of our n=550K primes! :surprised It will move him up to #17 on the scores list at top5000. If you remove the people who have found < 5 primes, he'd be #3! Benson, can you help push our 1st drive a little? lol Gary 

20090120, 00:58  #9 
May 2007
Kansas; USA
101×103 Posts 
Something smells extremely fishy about this recent huge submission:
http://primes.utm.edu/primes/page.php?id=86270 First time searcher...huge prime...at or near powerof10 k and nvalue...I've seen this kind of thing before and I'm thinking not! It looks like a "wannabe" prime. But who knows? Stranger things have happened! I'm putting a slow sore on sieving it to at least P=10G to see if I can save the top5000 site a little time. I know they do trial factoring before primality testing but I don't know if they sieve. I ran srsieve to P=300M with no factors found and now have it on sr1sieve, which appears will take ~510 mins. to build a Legendre symbol table before starting a much faster sieve. If it turns out to be prime, I'll be the first to retract my first para. here. Gary 
20090121, 05:20  #10  
May 2007
Kansas; USA
101×103 Posts 
Quote:
I ended up sieving 100000005*2^100000001 to P=25G...no factors found. I just now saw that the submission was proven composite...no surprise there. See http://primes.utm.edu/primes/page.php?id=86270. Also, another "smaller" submission for 1767766^32768+1 by the same person at http://primes.utm.edu/primes/page.php?id=86278 was also proven composite. It's clear that he did some sieving and then submitted them without primality testing hoping that they were prime. In doing that, he wasted over a day worth of CPU time at the top5000 site causing the proof of all of our legitimate submissions to slow down greatly. (I observed this.) Mr. Musatov, you are a bane to the primesearching community! Put in the CPU time like everyone else! Gary Last fiddled with by gd_barnes on 20090121 at 05:22 

20090121, 15:15  #11  
A Sunny Moo
Aug 2007
USA (GMT5)
14151_{8} Posts 
Quote:


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