20080907, 08:50  #1 
May 2007
Kansas; USA
276A_{16} Posts 
misc. k<300 statuses and primes
Use this thread for reporting any miscellaneous k<300 statuses and primes.
Here is an existing effort that I am aware of: I believe our C443 server has now completed a doublecheck effort for k=289 for n=520K600K. Carlos, can you confirm that and that no primes were found? Here are some upcoming efforts that I will work on: Mostly doublecheck efforts: k=47 for n=210K600K. k=53 for n=520K600K. Small new effort: k=65 for n=989.6K1M. (See below explanation.) Note that I'm not officially reserving k=47 and 53 per se because Beyond has them reserved at RPS per Karsten's and my k<300 page but I will search the ranges up until Beyond's last suspected search ranges, which are n=586K and n=582K respectively. I will stop at that point until I get a response from him to a PM that I sent him a week ago about whether he wishes to continue with these k's. If he unreserves them, we'll include them in our new upcoming k<300 drive for n=600K1M. For k=65, I am officially reserving that one but only for 23 days or until I complete it to n=1M. I'll use Bruce's sieved file for our new upcoming k<300 drive. (see below) I'm not sure why RPS didn't finish it up to n=1M. The starting nrange for k=47 and 53 is the last publicly reported range completed at RPS, regardless of whether subsequent primes were found. Each k had one prime above the lower nrange here. We're now getting in a clean up mode for some k<300 and will soon start a drive on either 16 or 18 k's that are not currently being worked on that are currently searched to n=600K. These k's have gone unsearched/unreserved for 12 years (most nearly 2 years) at RPS and several are well behind their neighbors on their range. Bruce's sieving on the new drive is currently at P=18T. He expects to finish it up to P=26T by this coming Thursday and the drive should then be ready to go. Look for a new thread to be started a couple of days before the drive starts. It should be very exciting and will give our regular searchers a greater variety of what to search! Gary Last fiddled with by gd_barnes on 20080908 at 09:35 
20080907, 09:21  #2 
Sep 2004
2×5×283 Posts 
About k=289. No primes found so far but there's still a small gap to be tested (45 candidates), someone with a new machine decided to play with llrnet...lol
I'm now going to change the settings of the server and that gap will be again distributed to the clients. I suppose it will be complete in less than an hour. Last fiddled with by em99010pepe on 20080907 at 09:24 
20080907, 13:18  #3  
A Sunny Moo
Aug 2007
USA (GMT5)
3×2,083 Posts 
Quote:


20080908, 09:24  #4 
May 2007
Kansas; USA
2·5·1,009 Posts 
In an effort to keep things open and up to date as possible for k<300:
I am assisting Anon in searching k=147 for n=600K1M. As of Sept. 5th, it was at n=675K. No primes yet. ETA on my completion of k=65 from n=989.6K to 1M is ~2 days. Sieving will complete on k=47 for n=210K600K and k=53 for n=520K600K early Tuesday. As stated previously, I'll doublecheck those up to the limit that Karsten's k<300 page shows them searched to, which would be n=586K and 582K respectively. I'm doing this because those ranges have never been publicly reported in any forum that I've seen and I'd like to get them reported to Wilfred Keller's k<300 ranges searched web page. Clearly there must have been some PM exchange at some point between previous searchers or Beyond and the admins at RPS about ranges completed that was never disclosed publicly. Gary Last fiddled with by gd_barnes on 20080908 at 09:31 
20080908, 10:11  #5 
May 2007
Kansas; USA
10090_{10} Posts 
k=289 is now officially complete to n=600K. No more primes were found.
Thanks Carlos and your buds for knocking this out so fast. 
20080910, 22:55  #6 
May 2007
Kansas; USA
276A_{16} Posts 
Statii...
Statii:
k=47 doublecheck just started and is at n=247K. No primes. Continuing. k=65 is now complete to n=1M. No primes. Unreserved. k=147 is at n=693K. No primes. Continuing. k=53 doublecheck will be started after k=47 is complete. Last fiddled with by gd_barnes on 20080910 at 22:55 
20080921, 10:04  #7 
May 2007
Kansas; USA
10090_{10} Posts 
k=47 doublecheck is at n=420K; no primes; continuing.
k=147 is at n=705K; no primes; continuing. 
20081031, 06:51  #8 
May 2007
Kansas; USA
2·5·1,009 Posts 
k=47 double check is at n=541K; 2 primes found:
47*2^4504701 is confirmed prime. 47*2^5404941 is a MISSING and NEW prime! This k was previously shown tested to n=586K! This is why we double check. It's all part of the project phylosophy: No prime left behind! :) k=53 double check is at n=578K; no primes found. k=147 is at n=725K; no primes found. Karsten, I would suggest changing the search ranges at Rieselprime.org for k=47 and 53 to what I show here due to the missing prime. Gary Last fiddled with by gd_barnes on 20081031 at 06:54 
20081031, 13:40  #9  
I quite division it
"Chris"
Feb 2005
England
100000011101_{2} Posts 
Quote:
iirc One of the 17orbust primes was from a double check. 

20081101, 03:26  #10 
May 2007
Kansas; USA
2×5×1,009 Posts 
In an Email exchange with Beyond several weeks ago, we got clear approval to search k=47 and 53 up to n=1M. His words were that he thought he searched both to the n=700K to 800K range and jumped to the n>1M range as requested by the RPS admins and subsequently may have searched to the 1.2M to 1.4M range. (?)
So...in addition to doublechecking them up to n=600K, I began a 'semi double check' search for n>600K a while back. Consequently I found that: 47*2^6953841 is prime 47*2^6957241 is prime A remarkable pair only n=340 apart! Can anyone else find a pair for the same k<=1001 so close together for n>300K? Gary 
20081101, 18:09  #11 
Dec 2002
2^{2}×3×37 Posts 
I saw those primes pop on the top 5000 site and checked thru my results. It appears I was running 47 on that machine we found to be giving dubious results on NPLB back in May.

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