20071108, 17:52  #35 
May 2007
Kansas; USA
5×31×67 Posts 
Doublecheck done for 300<k<500 for 50K<n<=100K
2 of the 7 100k ranges are complete for 300<k<=1001 for 50K<n<=100K. The 300's and 400's are done. I found the following missing primes:
349*2^560311 373*2^822311 497*2^669121 There were no incorrect primes. I doublechecked my doublecheck and confirmed that they were indeed prime. The error rate continues its steady climb. There was a 1.96% error rate for 25K<n<=50K. For 50K<n<=100K for the 300's and 400's, when adding 3 errors that were previously found and now corrected on our site, it's a total of 6 errors in 208 primes = 2.88%. For all of the k's that I've searched so far for 50K<n<=100K including errors found previously, it's 10 errors in 432 primes = 2.31%. The 500's and 900's are nearing completion and will be done by the weekend. There are some missing primes in the 900's and I'll post them when the ranges are done. When this is all done, we'll have all k<=1001 doublechecked up to n=100K! Edit: Thanks for info. Kosmaj! Gary Last fiddled with by gd_barnes on 20071108 at 18:05 
20071108, 18:37  #36 
Nov 2003
3622_{10} Posts 
Next you can double check some Ks from the 5th Drive. With exception of k=57 which has no gaps, the status of other four k<=135 is not clear because Sax hasn't reported his completed ranges, but you can work on k>200 with exception of k=285 which I mostly did and will finish it in a few days. Here is the list of remaining eight k>=213 (some have multiple small gaps):
Code:
k nmin nmax 213 100 250 237 230 260 249 150 200 249 230 260 261 135 150 261 155 260 267 155 160 267 180 205 267 260 300 273 100 120 273 130 150 273 155 170 273 175 180 279 100 130 279 135 145 279 155 165 279 230 260 291 130 165 Last fiddled with by Kosmaj on 20071108 at 18:42 
20071108, 22:34  #37  
May 2007
Kansas; USA
5×31×67 Posts 
Quote:
Thanks, Gary 

20071114, 18:44  #38 
May 2007
Kansas; USA
2891_{16} Posts 
Do. check for k=300400 & 9001001 for 50K<n<=100K
2 more of the 7 100k ranges are complete for 300<k<=1001 for 50K<n<=100K for a total of 4 of the 7 100k groupings complete. The 500's and 900's are done. I found the following missing primes:
937*2^517011 951*2^620931 There were no incorrect primes. The range of 500<k<600 had no errors. Oddly this range of k has had NO errors for any k for any n all the way up to n=100K! At least one small range of k has been accurate all the way through. Once again, I doublechecked my doublecheck and confirmed that they were prime. The total # of errors and primes for the 300s, 400s, 500s, & 900s for n=50K100K including errors found before is: 8 errors in 430 primes = 1.86%. The errorless 500s helped drop it back under 2%. Kosmaj, this leaves 600<k<900 to go for this effort. They are collectively about 6570% done so it should be ~5 days before completion. At that time, I'll have 2 cores to start sieving on the k's and ranges that you suggested. Gary Last fiddled with by gd_barnes on 20071114 at 18:50 
20071120, 06:18  #39 
May 2007
Kansas; USA
5×31×67 Posts 
Kosmaj,
All doublechecking for 300<k<=1001 for n=50K100K will be done in 23 days. I have taken one core off of it and am using the other core to now sieve the k's<300 for the ranges that you suggested. I don't have an ETA on completion of it yet but a wild guess would be 45 weeks on one 2.66Ghz P4 core. Gary 
20071121, 07:59  #40 
May 2007
Kansas; USA
5·31·67 Posts 
300<k<=1001 for n=50K100K doublecheck complete
I have completed all kranges for the doublecheck for 300<k<=1001 for n=50K100K. The ranges left to report were for k's in the 600s, 700s, and 800s. This was the most problematic area. I have found the following additional 5 missing primes:
619*2^622091 675*2^674561 749*2^603081 781*2^635371 883*2^721511 There were no incorrect primes and I doublechecked my finds to confirm primality. This makes a total of 10 errors found with this particular effort. That in addition to 7 errors found previously for n=50K100K makes a total of 17 errors for this nrange. With the above bad kranges, the errorrate continues its steady climb: n=010K; 1 error out of 7065 primes; 0.01% n=10K25K; 9 out of 940; 0.96% n=25K50K; 14 out of 716; 1.96% n=50K100K; 17 out of 732; 2.32% We can now officially say that all k<=1001 are doublechecked up to n=100K!! Anon, if you happen to read this, sometime in the spring of 2008, I might hit you up with helping me coordinate a doublecheck for n=100K260K for 300<k<=1001 using Prime Grid/BOINC/LLRnet in some fashion. Do you think that would be doable? With the above statistics, we definitely need to get all Prime Search ranges doublechecked. n=100K260K for 351 k's will be a HUGE effort that certainly needs some DC. Gary 
20071121, 08:51  #41 
Sep 2004
101100001110_{2} Posts 
Gary,
Please count with my help.... Carlos 
20071121, 16:02  #42 
May 2007
Kansas; USA
5×31×67 Posts 

20071121, 16:56  #43  
A Sunny Moo
Aug 2007
USA (GMT5)
3×2,083 Posts 
Quote:
As for using PrimeGrid/BOINC/LLRNet to help do the 300<k<1001 doublecheck sometime later: Yes, it might be doablewould this be considered part of RPS, or would it be considered an outside effort? If it would be part of RPS, then we obviously already have Kosmaj's ruling that RPS should stay independent (i.e. no PrimeGrid)but if it's separate from RPS (since those are Prime Search ranges, thus not technically RPS), then we might be able to go that route. 

20071121, 19:32  #44  
May 2007
Kansas; USA
5×31×67 Posts 
Quote:
I would consider this to be projectindependent. It's neither RPS nor Prime Search nor any other project. I'm just choosing to coordinate it here because I know people here and 15k.org now lists ALL known Riesel k's. For that matter, I could have coordinated it through one of the other Prime search projects here at mersenneforum.org. Gary 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Double checking of Results  pinhodecarlos  Prime Gap Searches  13  20171209 06:07 
What about doublechecking TF/P1?  137ben  PrimeNet  6  20120313 04:01 
Double checking  Unregistered  Information & Answers  19  20110729 09:57 
Doublechecking milestone?  jobhoti  Math  17  20040521 05:02 
Any glory in double checking?  Quacky  Lounge  5  20031203 02:20 