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Forum: Riesel Prime Search 2020-11-12, 15:48
Replies: 373
Views: 46,012
Posted By Thomas11
3000-3100 complete (3 primes).

3000-3100 complete (3 primes).
Forum: Riesel Prime Search 2020-11-12, 15:44
Replies: 1,955
Views: 187,469
Posted By Thomas11
From our 1st megabit drive: 111*2^3060238-1...

From our 1st megabit drive:

111*2^3060238-1 (921226 digits)
65*2^3080952-1 (927461 digits)
57*2^3093440-1 (931220 digits)
Forum: Riesel Prime Search 2020-07-19, 14:34
Replies: 27
Views: 9,777
Posted By Thomas11
The tool doesn't check for algebraic factors......

The tool doesn't check for algebraic factors... :no:
Forum: Riesel Prime Search 2020-07-13, 14:05
Replies: 1,955
Views: 187,469
Posted By Thomas11
233*2^2426512-1 (730456 digits)

233*2^2426512-1 (730456 digits)
Forum: Riesel Prime Search 2020-06-22, 09:27
Replies: 1,000
Views: 114,833
Posted By Thomas11
status report

k=119 at n=7M
k=211 at n=7M
k=217 at n=7M
k=223 at n=7M
k=239 at n=7M
k=269 at n=7M
k=283 at n=7M
Forum: Riesel Prime Search 2020-05-31, 13:38
Replies: 373
Views: 46,012
Posted By Thomas11
Taking 3000-3100 (= 3.0M-3.1M).

Taking 3000-3100 (= 3.0M-3.1M).
Forum: Riesel Prime Search 2020-03-06, 16:40
Replies: 23
Views: 6,494
Posted By Thomas11
Looks quite interesting! :smile: I did some...

Looks quite interesting! :smile:

I did some tests. Single thread performance is indeed almost identical to LLR64.
However, multithreading doesn't seem to work as expected:

single-threaded:
...
Forum: Riesel Prime Search 2020-02-29, 15:06
Replies: 442
Views: 46,650
Posted By Thomas11
The attached file contains 322220 k (up to 100M)...

The attached file contains 322220 k (up to 100M) with Nash weight less or equal to 250.
Forum: Riesel Prime Search 2020-02-29, 13:03
Replies: 442
Views: 46,650
Posted By Thomas11
A bunch of about 4500 low weight k's can be found...

A bunch of about 4500 low weight k's can be found here. (https://www.mersenneforum.org/showpost.php?p=78349&postcount=78)
Forum: Prime Gap Searches 2020-02-14, 08:52
Replies: 91
Views: 17,344
Posted By Thomas11
Well, occasionally a had the same effect here...

Well, occasionally a had the same effect here (Excel 2016, 32 bit):
The screen freezes and it tells me "the application doesn't respond anymore".
But the computations continue and once they are...
Forum: Prime Gap Searches 2020-02-13, 16:45
Replies: 91
Views: 17,344
Posted By Thomas11
Meanwhile I've found the time to test your VBA...

Meanwhile I've found the time to test your VBA code on my workplace PC.
While I'm getting only 550e6/s (indicating that my PC is slower than yours), I can confirm that the two programs are...
Forum: Prime Gap Searches 2020-02-09, 12:08
Replies: 91
Views: 17,344
Posted By Thomas11
Thanks for sharing your VBA code, mart_r! :smile:...

Thanks for sharing your VBA code, mart_r! :smile:

I will have a look into it and give it a try when I'm back in my office next week (don't have Excel at home)...
Forum: Riesel Prime Search 2020-02-06, 09:45
Replies: 1,955
Views: 187,469
Posted By Thomas11
Congratulations! :banana::banana::banana: So...

Congratulations! :banana::banana::banana:

So close to 2 million decimal digits...
Forum: Riesel Prime Search 2020-01-19, 11:44
Replies: 1,955
Views: 187,469
Posted By Thomas11
283*2^6804731-1 (2048431 digits) :smile:

283*2^6804731-1 (2048431 digits) :smile:
Forum: Prime Gap Searches 2020-01-17, 08:30
Replies: 91
Views: 17,344
Posted By Thomas11
Yes,in order to reduce the amount of data you...

Yes,in order to reduce the amount of data you should set the gap closer to the unknown gap. However, there shouldn't be any noticeable speed-up.
Forum: Prime Gap Searches 2020-01-12, 09:54
Replies: 91
Views: 17,344
Posted By Thomas11
I cannot test it right now, but you should be...

I cannot test it right now, but you should be able to do this with "update_gap_list.pl" as well.

"update_gap_list.pl" will keep only the first occurrences. So, in principle you could use it to...
Forum: Prime Gap Searches 2020-01-09, 12:52
Replies: 91
Views: 17,344
Posted By Thomas11
Note that the Perl scripts for manipulating the...

Note that the Perl scripts for manipulating the gap results use a "hard coded" upper limit of 200000 for the gap length. So you'll need to adjust this, once you find even larger gaps.
Forum: Prime Gap Searches 2020-01-06, 08:34
Replies: 91
Views: 17,344
Posted By Thomas11
Here are two perl scripts for managing the gap...

Here are two perl scripts for managing the gap results.

Both assume that your master gap list is stored in the file "gaplist.txt" (an example file with gaps up to 1e12 is included).

Usage is as...
Forum: Prime Gap Searches 2020-01-03, 15:01
Replies: 226
Views: 33,730
Posted By Thomas11
As far as I can tell (from being a Linux user)...

As far as I can tell (from being a Linux user) the "start" command opens a new command shell and will execute "twingaps3.exe" in this new shell. Quite likely you will need to assign the path of your...
Forum: Prime Gap Searches 2020-01-02, 16:35
Replies: 91
Views: 17,344
Posted By Thomas11
Here are the first occurrences of gaps between...

Here are the first occurrences of gaps between quadruplets searched up to 1e12.

Largest gap: 85025 342611795411

Smallest unknown gap: 21764

I stopped my search at 1e12, so you may continue...
Forum: Prime Gap Searches 2020-01-02, 15:15
Replies: 226
Views: 33,730
Posted By Thomas11
The earlier Windows binary used Linux line...

The earlier Windows binary used Linux line endings (without carriage return) which could be a pain when opening the results files with certain text editors.

So, here comes a new version with...
Forum: Prime Gap Searches 2020-01-02, 15:02
Replies: 91
Views: 17,344
Posted By Thomas11
Here is a C program based on my twingaps program...

Here is a C program based on my twingaps program (itself based on fastsieve by TOS). A Windows binary is included as well as a batch file for running it.

In order to save the results you should...
Forum: Prime Gap Searches 2020-01-02, 11:39
Replies: 226
Views: 33,730
Posted By Thomas11
Here comes a Windows binary together with an...

Here comes a Windows binary together with an example run script (batch file).
Make sure to put the accompanying "cygwin1.dll" into the same directory.

For production runs you should redirect the...
Forum: Riesel Prime Search 2020-01-01, 00:26
Replies: 2
Views: 3,030
Posted By Thomas11
Largest k*2^n-1 Primes Found In 2019

Here is the list of 78 largest "Riesel" primes (k*2^n-1, k>1) found in 2019.
(Again less than 100 Riesel primes have been submitted to the Top5000 list in 2019.)

Meaning of rank marks:
r1, rank...
Forum: Prime Gap Searches 2019-12-30, 09:26
Replies: 226
Views: 33,730
Posted By Thomas11
Regarding an implementation in C: I slightly...

Regarding an implementation in C:

I slightly modified Tomás Oliveira e Silva's fast_sieve.c from 2010 in order to search for gaps between twin primes (see attachment).
It seems to be pretty fast...
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