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2020-09-25, 21:11   #1376
MisterBitcoin

"Nuri, the dragon :P"
Jul 2016
Good old Germany

2·52·17 Posts

Quote:
 Originally Posted by gd_barnes There are many bases with 2 k's remaining at n=300K or 400K. Why do you choose to take two k's only out of a base with so many k's remaining? You say you will search them until you find a prime. What makes you think you would find a prime on them before you get bored with them? It is very likely that would happen. The chances of you finding a prime on them for n=350K-1M are very remote because of how low-weight they are. I'll tell you what. Run a single test at n=770K (~65% of the n-range). See how long it takes. Multiply that by the number of tests that you have to get the total CPU time. Then divide that by your number of cores that you will be running on it 24 hours a day 7 days a week. Then report that time back here. If you can honestly say that you will run all the cores that you reported here in the above calculation full time and you can provide a status report once a month I will reserve them for you. The biggest problem that CRUS has is people reserving way more work than they realize. We've also had people reserve things "until they find a prime" not realizing how remote that chance is and how long the tests begin to take in rapid fashion.

I will perform those tests over the weekend and report the results on monday.

2020-09-29, 17:41   #1377
MisterBitcoin

"Nuri, the dragon :P"
Jul 2016
Good old Germany

2·52·17 Posts

Quote:
 Originally Posted by MisterBitcoin I will perform those tests over the weekend and report the results on monday.

A run at n=590K takes around 1050 secs.
A run at around 780K takes around 3500 secs.

That makes around 7,7 months for one of those sequences; if using two servers. However without a deeper sieve file i wont start working on them. A sieve up to P = 1e15 should erase around 500 or 600 canidates.

It is still a lot of work regardless, but i think i can handle it. ^^

2020-10-04, 17:38   #1378
masser

Jul 2003
Behind BB

7×269 Posts
R6 Update

R6 tested to n = 5.4e6. Residues attached. Testing continues.
Attached Files
 R6_5p3M_res.txt (48.4 KB, 161 views)

 2020-10-24, 09:18 #1379 rebirther     Sep 2011 Germany C2E16 Posts Reserving S30 to n=1M (800k-1M) for BOINC
 2020-11-08, 20:27 #1380 rebirther     Sep 2011 Germany 311810 Posts Reserving R25 to n=300k (150-300k) for BOINC --> all available k by sievefile
 2020-11-22, 19:00 #1381 rebirther     Sep 2011 Germany C2E16 Posts R25 tested to n=300k (150-300k) 9 primes found, 108 remain Results emailed - Base released
 2020-11-24, 19:45 #1382 rebirther     Sep 2011 Germany 2×1,559 Posts S30 tested to n=1M (800k-1M) nothing found, 2 remain Results emailed - Base released
 2020-12-13, 17:16 #1383 rebirther     Sep 2011 Germany 2·1,559 Posts Reserving R7 to n=100k (25-100k) (200-300M) for BOINC
 2020-12-14, 18:00 #1384 rebirther     Sep 2011 Germany 60568 Posts S9 tested to n=5M (2-5M) nothing found, 1 remain Results emailed - Base released
 2020-12-19, 13:12 #1385 Xentar     Sep 2006 Germany 2×5×19 Posts s19 tested till n=191k New primes: Code: 441244*19^190791+1
2021-01-12, 18:40   #1386
MisterBitcoin

"Nuri, the dragon :P"
Jul 2016
Good old Germany

85010 Posts
Small range of R7 proven

Working on a large base like R7 is troublesome, but i still decided to give it some effort.

And after a few days i have results. The range 408034000000 up to 408034255081 is proven.

The last k just fell a few hours ago.

Code:
408034056294*7^226772-1 is prime! (191657 decimal digits, P = 3)  Time : 342.596 sec.
The results and primes can be found in results_max_range_R7.zip. The files created from srbsieve will be added in a few minutes. (Edit: added now)

I am reserving the range >408G for testing up to n=25K. [5400 k´s remaining at n=3350; quickly decreasing]
Attached Files
 results_max_range_R7.zip (391.5 KB, 94 views) R7_maximum_range.zip (254.2 KB, 90 views)

Last fiddled with by MisterBitcoin on 2021-01-12 at 18:41

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