20041101, 20:40  #1 
Jul 2003
Behind BB
41·47 Posts 
primesearch
Hi all,
Does anyone here contribute to the primesearch project located at: www.mycgiserver.com/~primesearch/ We (the 15k group) completed the k<250, n<200000 search earlier this summer with amazing speed and relatively few errors, in my opinion. Since then, it seems like the 15k project has lost any focus it had. What are we doing now? Until two weeks ago, I was considering proposing that we help primesearch complete the k<1000, n<200000 search. However, their webpage has been unusable the last week or so and I tried contacting their admin but got no response. Is anyone here capable of logging into their webpage and reserving ranges? If the primesearch webpage becomes operable again, would anyone be interested in completing all of the ranges with n<200000? I bet we could do it before the end of the year. best regards, Tom 
20041102, 08:43  #2  
Nov 2003
Thailand
11 Posts 
Quote:
I have been able to log in there but not to be able to submit my results 

20041102, 16:09  #3 
Apr 2004
187_{10} Posts 
I've been unable to login for the last two weeks. I just posted to the yahoo primenumber list about it. I've sent emails to the webmaster, but get no replies.
It's often taken me several retries in the past, especially to post results; but now it seems totally down. Harvey563 
20041102, 16:57  #4 
Apr 2004
11·17 Posts 
riesel ranges
For what it's worth, I can tell you all that I am intending to check the ranges
451, 453, 455; and 469, 471, 473, 475, 477, 479, 481, 483, 485, 487, &489 from 190000 to 230000 in the near future. So if anyone has already checked any of them, I'd appreciate a heads up. Dale Andrews maintains a list of Riesel ranges with k values from 300 to 1000 at http://www.geocities.com/primes_r_us/riesel/index.html I keep a list of Riesel ranges that I have checked at http://www.geocities.com/harvey563/reisels.txt Harvey563 
20041102, 21:59  #5  
Sep 2002
406_{8} Posts 
Quote:
Joss Last fiddled with by jocelynl on 20041104 at 00:00 

20041103, 18:53  #6  
Jul 2003
Behind BB
41·47 Posts 
Quote:
Thanks for the link. I'm going to send my results to Dale Andrews' site and post any ranges I plan on searching here in the forum. Right now, I'm working on ranges for k=555, 639, 903, 933 and 975; testing all of them to n=200000. regards, Tom 

20041205, 21:29  #7 
Jul 2003
Behind BB
41·47 Posts 
The primesearch webpage appears to be operational again.
The results submission is still a little buggy. I had to expire a lot of the ranges that I have not yet completed before I could submit the results for my completed ranges. Regards, Tom 
20050323, 18:10  #8 
May 2004
FRANCE
2^{2}·149 Posts 
14 False primes corrected in PrimeSearch results
Hi All,
While testing the last LLR version on the whole PrimeSearch project database (downloaded the 12/02/05), I found 14 numbers which are composite, while registered as prime(I confirmed these results with Proth 7.0). In order to help to correct the database, I have redone the 14 ranges containing an error, thinking that the senders had really found primes, but made typos... In fact, I found 13 primes which are certainly the true ones, and which, all but two, seem to be typos (one false digit, or two permuted digits in exponent...). Only one problem was then remaining : For k=825, I found no primes in the range n=120000 to 130000, so, I contacted Footmaster, the sender of the false prime 825*2^1292361, who gave me the solution : the very prime is 825*2^129236+1 so, out of this topic! I sent these results to Michael Hartley, but he told me that he has difficulties to insert the corrections in the database, So, I will now send you below my completed results : 1) k = 261, n = 90000 to 100000, 1 prime found. 261*2^908611 is prime! (instead of 261*2^907631). 2) k = 291, n = 70000 to 80000, 1 prime found. 291*2^725131 is prime! (instead of 291*2^775131). 3) k = 453, n = 175000 to 180000, 1 prime found. 453*2^1768601 is prime! (instead of 453*2^1767271). 4) k = 495, n = 48000 to 60000, 1 prime found. 495*2^508331 is prime! (instead of 495*2^508831). 5) k = 609, n = 48000 to 60000, 2 primes found. 609*2^553071 is prime! O.K. 609*2^577691 is prime! (instead of 609*2^577091). 6) k = 635, n = 130000 to 135000, 1 prime found. 635*2^1325481 is prime! (instead of 635*2^1321621 ). 7) k = 651, n = 16000 to 32000, 6 primes found. 651*2^160421 is prime! O.K. 651*2^174531 is prime! O.K. 651*2^191811 is prime! O.K. 651*2^219221 is prime! O.K. 651*2^240251 is prime! (instead of 651*2^240351). 651*2^264411 is prime! O.K. 8) k = 665, n = 32000 to 48000, 5 primes found. 665*2^348421 is prime! O.K. 665*2^357921 is prime! O.K. 665*2^394641 is prime! O.K. 665*2^404981 is prime! (instead of 665*2^404081). 665*2^408401 is prime! O.K. 9) k = 711, n = 215000 to 220000, 1 prime found. 711*2^2156811 is prime! (instead of 711*2^2158611 ). 10) k = 735, n = 160000 to 165000, 1 prime found. 735*2^1631391 is prime! (instead of 735*2^1631691). 11) k = 825, n = 120000 to 130000, no primes found (instead of 1). 825*2^1292361 is composite, but 825*2^129236+1 is prime! 12) k = 873, n = 32000 to 48000, 3 primes found. 873*2^354861 is prime! O.K. 873*2^378321 is prime! O.K. 873*2^442511 is prime! (instead of 873*2^442501). 13) k = 945, n = 16000 to 32000, 4 primes found. 945*2^212001 is prime! O.K. 945*2^248301 is prime! O.K. 945*2^289221 is prime! O.K. 945*2^310621 is prime! (instead of 945*2^210621). 14) k = 959, n = 16000 to 32000, 2 primes found. 959*2^162201 is prime! O.K. 959*2^264281 is prime! (instead of 959*2^262481). Perhaps Michael Hartley will later insert these results in his errata page. Best Regards, Jean 
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