20071129, 05:16  #122  
A Sunny Moo
Aug 2007
USA
2·31·101 Posts 
Quote:


20080202, 09:43  #123 
Sep 2002
Database er0rr
11C6_{16} Posts 
I thought I had better write something about how things are going for the 321search project.
We have no numbers less than 1 million digits left for first time testing. PrimeGrid have been on board for a couple of months and they have increased the search's throughput greatly. We have started testing at 4 million bits. The new batch here for manual testing takes much longer, nearly 50% longer, to crunch compared to the previous batch because the new ones are much longer  PrimeGrid and James Burt are doing the intermediate ones  and use a bigger FFT window. The effect of worse caching and bus contention must kick in at some length  whether we are there yet I do not know. Last fiddled with by paulunderwood on 20080202 at 15:04 
20080326, 19:38  #124 
Sep 2002
Database er0rr
4550_{10} Posts 
My thanks goes to Xyzzy for uploading and hosting the new batch of input files.
Candidate primes start at n=4.35 million or 1,309,480 decimal digits. There is a new FFT size for this batch, so expect individual tests to take about 20% longer than before. Good luck! 
20080424, 20:53  #125 
Sep 2002
Database er0rr
11C6_{16} Posts 
The plan now for 321search is to continue with PrimeGrid to n=5M. Thereafter PrimeGrid will take over. They are currently sieving to n=10M. I guess there are 2 or 3 more primes below that.
There is a chance we will find another megaprime below n=5M  I am hoping for some bunching now in the sequence of 321 primes With PrimeGrid's help we should be able to finish to n=5M within 6 months 
20080521, 06:22  #126 
Sep 2002
Database er0rr
2·5^{2}·7·13 Posts 
PrimeGrid have been running "Drive for Five" for the last week. It will be running until the end of this month. Even if they fail to reach n=5M by then, the time to completing our task will have been greatly shortened  anything remaining will be mopped up within a month or two
Maybe we will have a bonus prime too Last fiddled with by paulunderwood on 20080521 at 06:34 
20080615, 12:05  #127 
Sep 2002
Database er0rr
2×5^{2}×7×13 Posts 
PrimeGrid and many of its members have done a great work to get to 5M. Although there are hundreds of results to come in, they have exhausted their 321 input :surprised
James Burt has a few outstanding ranges below n=4M. Many of them will be put on the PG server soon. I am still hoping all n=sub5M will be done by the end of June, but my guess is that there will be a few left over to do then. Unfortunately, no prime has showed up yet Last fiddled with by paulunderwood on 20080615 at 12:07 
20080815, 22:45  #128 
Sep 2002
Database er0rr
2·5^{2}·7·13 Posts 
I happy now with the coverage of 321 numbers below n=5M. Before this project is achived, I will create a new thread with all the results, including:
Last fiddled with by paulunderwood on 20080815 at 22:46 
20080922, 21:11  #129 
Sep 2002
Database er0rr
2·5^{2}·7·13 Posts 
A change of plan: I have handed all the 321 factors and LLR results over to PrimeGrid. John says they hope to make a public database in the future.
I would like to thank the following for their help with "321search" over the last few years: * Thomas Ritschel for his major contributions with sieving, crunching LLR, scripts, encouragement, discussion and ideas. * The many loyal sievers and LLR crunchers who are listed on this subforum and at The Prime Pages * PrimeGrid users and its organizers for their huge boost to throughput towards the n=5M goal * Programmers: Jean and George for LLR; Paul Jobling and Geoff for their sieves; Phil Carmody for some Perl wizardry * Xyzzy for allowing and managing this great message board Anyone wanting to do some "321" crunching can head over to PrimeGrid, where their help will be welcomed. Last fiddled with by paulunderwood on 20080922 at 21:41 
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