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-   -   k=13236795 (https://www.mersenneforum.org/showthread.php?t=6529)

kar_bon 2020-12-16 12:21

I've included [url='https://www.rieselprime.de/ziki/Riesel_prime_13236795']k=13236795[/url] into the Wiki with the history data from this thread and reserved for you.
Not listed the sieve depth, but could do if needed.
Also I have to check the old 15k-threads for older information.

And give me a clue: Here and in the Top5000 pages you are listed as "Valerie", but signing here as Cedric. I've inserted a Person page (including the current reservation) for "Valerie" (because official), if this should be changed please PM me.

gd_barnes 2021-04-03 10:55

1 Attachment(s)
Some bad news...

I have completed a double-check up to n=1M on this k. I found 7 missing primes. They are:
13236795*2^233152-1
13236795*2^240236-1
13236795*2^258893-1
13236795*2^259747-1
13236795*2^266093-1
13236795*2^267313-1
13236795*2^314563-1

Valerie,

It appears that some sieving was done incorrectly for the range of n=220K-450K. I looked at the statuses in the old 15k search thread and found that your number of tests was much less than were in a file sieved by me to P=50T.

Here is the thread:
[URL]https://www.mersenneforum.org/showthread.php?t=3705[/URL]

Here is a comparison of your number of tests in that thread compared to the number of tests in a file sieved to P=50T:

post #11; n=220K-231K; 744 tests; sieve 1439 tests; 51.7% tested
post #20; n=231K-240K; 576 tests; sieve 1183 tests; 48.7% tested
post #21; n=240K-250K; 674 tests; sieve 1319 tests; 51.1% tested
post #22; n=250K-280K; 1997 tests; sieve 3944 tests; 50.6% tested
post #23; n=280K-300K; 1295 tests; sieve 2652 tests; 48.8% tested

Summary total for n=220K-300K:
5286 tests; sieve 10537 tests; 50.2% tested; 5251 tests missing

Your sieve depth back then was far less than P=50T so you should have more than 100% tested of my file.

Clearly this only covers part of the "problem" 220K-450K range but the above was all that I found with enough detail on your number of tests to make a comparison to my file.

I suspect that post #6 was the error. Where you state "Currently resieving the range 220000 through 500000 with Proth 0.42...found 3000+ factors which NewPGen initially not found". You may have been sieving for Proth primes, i.e. +1 instead of Riesel -1, and the program removed a lot of good Riesel tests. Also 3000+ factors after you have already sieved for quite awhile with NewPGen seems like a large number. I suspect that was in error.

It appears that you later used a different sieve for n=450K-1M so the range of n=450K-500K looks OK.

I also looked at your results for n=1M to 1.3M. The number of tests keeps rising abnormally as the testing gets higher:
n=1.0M-1.1M 12752 tests
n=1.1M-1.2M 13218 tests
n=1.2M-1.3M 14251 tests

n=1.2M-1.3M has 11.8% more tests than n=1.0M-1.1M, which is an unusual fluctuation considering it is a higher n-value. You may want to look into that. For comparison a sieve to P=50T has 13293, 13210, and 13139 tests respectively for the ranges.

I will continue double-checking this k up to your current test limit of n=1.3M. It should be done in ~5 days.

I've attached the primes and residues for n=0-1M and the sieve file for n=0-2M that is sieved to P=50T.

The good news is that this k now has 113 primes for n<=1.3M...a very large number. :-)

Gary

ValerieVonck 2021-04-03 14:53

Thank you gd barnes for double checking!

So it is time for an update...
Since the confinements in belgium last / this year I cannot dedicate full time to this project
I am staying with my elderly parents to take care for them
I will see what I will decide when my last sieving range is done
I hope that I soon can return home and finish this range
Fyi I’am using srsieve 1.54 on my intel mac 2015 model :smile:

Kind regards
Valerie

gd_barnes 2021-04-08 03:55

1 Attachment(s)
k=13236795 double-check is complete to n=1.3M. No problems were found for n=1M-1.3M. Primes and results attached.

I'll keep the remaining file for n=1.3M-2M sieved to P=50T available if needed in the future.

ValerieVonck 2021-04-08 03:57

[QUOTE=gd_barnes;575466]k=13236795 double-check is complete to n=1.3M. No problems were found for n=1M-1.3M. Primes and results attached.

I'll keep the remaining file for n=1.3M-2M sieved to P=50T available if needed in the future.[/QUOTE]

Thank you gd_barnes!!
Kind regards,
Valerie

kar_bon 2021-04-08 07:04

[QUOTE=gd_barnes;575466]k=13236795 [...] I'll keep the remaining file for n=1.3M-2M sieved to P=50T available if needed in the future.[/QUOTE]

Gary, there's an option to include a [B]zipped[/B] sieve file in the Wiki, for example see [url='https://www.rieselprime.de/ziki/Riesel_prime_98475']k=98475[/url]:
- edit the page
- if not yet done: insert the "RSieve" parameter
- set the value like "y" for yes
- choose "Show preview" -> next to k-value "Upload me!"
- open link in new tab
- choose you local file (not greater than 2MByte!), Wiki name is given
- upload and close the file-page
- choose "Show preview" on the k-value page again, everything ok? -> save
- link is blue as "(sieve)" downloadable for everyone

gd_barnes 2021-04-08 08:27

[QUOTE=kar_bon;575476]Gary, there's an option to include a [B]zipped[/B] sieve file in the Wiki, for example see [URL="https://www.rieselprime.de/ziki/Riesel_prime_98475"]k=98475[/URL]:
- edit the page
- if not yet done: insert the "RSieve" parameter
- set the value like "y" for yes
- choose "Show preview" -> next to k-value "Upload me!"
- open link in new tab
- choose you local file (not greater than 2MByte!), Wiki name is given
- upload and close the file-page
- choose "Show preview" on the k-value page again, everything ok? -> save
- link is blue as "(sieve)" downloadable for everyone[/QUOTE]


Done. Cool option!

ValerieVonck 2021-11-16 10:54

Progress information:
- Sieved to 260T

Plannned:
- Sieve to 300T (it will take a couple of months, but I have more confidence in this now)

OR
- Start testing 1.3M to 2M
-> I have to examine that LLR is available for armhf64 (RaspberryPi 3B & Pi 4)

OR
As gd-barnes mentioned, that I have missed a lot of factors when starting to sieve with newPGen
and restarting the sieve almost from the beginning

OR
start to P-1 a batch of numbers...

Kind regards,
Valerie

Way forward:
- Start a distributed coordination thread for LLR'ing this number.

gd_barnes 2021-11-16 17:55

You should use the sieve file that I sieved to P=50T. It is a good file and it is a sufficient sieve depth for n<2M. It is attached to post #90.

paulunderwood 2021-11-16 18:04

[QUOTE=ValerieVonck;593231]
OR
- Start testing 1.3M to 2M
-> I have to examine that LLR is available for armhf64 (RaspberryPi 3B & Pi 4)
[/QUOTE]

It is not available for armhf64. Our only hope is that somehow Ernst's Mlucas library could do it. Ernst? Pi's etc are much slower than AMD/Intel x86/x64 at crunching mega bit numbers

ValerieVonck 2021-11-16 18:08

[QUOTE=gd_barnes;593252]You should use the sieve file that I sieved to P=50T. It is a good file and it is a sufficient sieve depth for n<2M. It is attached to post #90.[/QUOTE]

Thank You sir!
I will be checking thaïs out asap!


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