Post small primes and tell us about your progress here

[Viliam Furik]

I have tested k=20020913 and found these primes:

20020913*2^12-1
20020913*2^14-1
20020913*2^22-1
20020913*2^62-1
20020913*2^72-1
20020913*2^76-1
20020913*2^78-1
20020913*2^88-1
20020913*2^94-1
20020913*2^112-1
20020913*2^120-1
20020913*2^204-1
20020913*2^462-1
20020913*2^1214-1
20020913*2^1798-1
20020913*2^2022-1
20020913*2^3256-1
20020913*2^6406-1
20020913*2^8548-1
20020913*2^18088-1
20020913*2^62416-1
20020913*2^111300-1
20020913*2^162118-1
20020913*2^230406-1
20020913*2^240084-1
20020913*2^316934-1

[Nescro]

I have now searched k=3382599 from n=250k to n=500k.

Primes:
3382599*2^263753-1
3382599*2^273764-1
3382599*2^283188-1
3382599*2^347133-1
3382599*2^376247-1
3382599*2^381211-1
3382599*2^496591-1

[Nescro]

k=8847 has been checked up to n=500k.

During these tests the following primes were discovered:

8847*2^52260-1
8847*2^53560-1
8847*2^58340-1
8847*2^67918-1
8847*2^127413-1
8847*2^418900-1

[storm5510]

Originally Posted by Nescro

k=8847 has been checked up to n=500k...

Why to only 500,000?

[Happy5214]

Originally Posted by Nescro

k=8847 has been checked up to n=500k.

Originally Posted by storm5510

Why to only 500,000?

The largest known prime for that k is n=671298, thus I would have tested it to around that level (probably n=675k, since I prefer to round to the next 5k interval). 500k is the limit of my misc_small personal PRPNet server, and this k isn't special enough to run separately, so I won't take it, though I am curious how long it would take. I'll see if I can pull it out of the RSP sieve data.

[storm5510]

Originally Posted by Happy5214

The largest known prime for that k is n=671298, thus I would have tested it to around that level (probably n=675k, since I prefer to round to the next 5k interval). 500k is the limit of my misc_small personal PRPNet server, and this k isn't special enough to run separately, so I won't take it, though I am curious how long it would take. I'll see if I can pull it out of the RSP sieve data.

I ran a lot of these early last year, but the kitchen became too hot so I baled out. I was browsing the Prime Wiki last night and I found something interesting. I have had a cold Xeon sitting in a corner for months. k=6927 had been tested to n=400e3. As a brain exercise, I decided to see if I could remember how run the sieve programs. I started it with n=400e3, N=1e6, and P=25e11. To my amazement, the sieve started correctly. It will finish somewhere around 1330 GMT tomorrow.

A year ago, it seemed like I was always stepping on somebody's toes with what I was doing. I found it difficult to determine what others were running. The Prime Wiki was still limited at the time so I really could not depend on it solely. Some used it, but most did not. I am pleased to see how far the wiki has come since.

As for running the LLR test on this sieve, I might, then again, I might not. If I did, I would put the completed results here. If they were needed, that would be alright, If not, that would be alright as well. I could post the finished sieve here in case somebody else would like to run it.

[Happy5214]

Originally Posted by storm5510

I ran a lot of these early last year, but the kitchen became too hot so I baled out. I was browsing the Prime Wiki last night and I found something interesting. I have had a cold Xeon sitting in a corner for months. k=6927 had been tested to n=400e3. As a brain exercise, I decided to see if I could remember how run the sieve programs. I started it with n=400e3, N=1e6, and P=25e11. To my amazement, the sieve started correctly. It will finish somewhere around 1330 GMT tomorrow.

A year ago, it seemed like I was always stepping on somebody's toes with what I was doing. I found it difficult to determine what others were running. The Prime Wiki was still limited at the time so I really could not depend on it solely. Some used it, but most did not. I am pleased to see how far the wiki has come since.

As for running the LLR test on this sieve, I might, then again, I might not. If I did, I would put the completed results here. If they were needed, that would be alright, If not, that would be alright as well. I could post the finished sieve here in case somebody else would like to run it.

I was going to run the sieve myself, but then I remembered PrimeGrid already does sieving for all k's < 10k to much deeper levels than I could ever do (see https://www.mersenneforum.org/showthread.php?t=18255). I'll attach the extracted file for this k for n=500k to 675k. Extracting it actually locked up my desktop (ran out of memory), forcing me to reboot, and killed my mprime P-1 job on my new 64 GB RAM laptop (same reason), so I had to make the necessary trimming in the standard Unix line editor ed (which still took up over 6 GB of RAM even with no visual display). I even wrote a lament about it (based on the theme song to The Brady Bunch).

As for the issue of stepping on people's toes, I always reserve sequences I work on if they're over n=50k. Below that, it only takes a few hours on my slowest computer, so it's not usually necessary.

[storm5510]

Originally Posted by Happy5214

I was going to run the sieve myself, but then I remembered PrimeGrid already does sieving for all k's < 10k to much deeper levels than I could ever do (see https://www.mersenneforum.org/showthread.php?t=18255). I'll attach the extracted file for this k for n=500k to 675k. Extracting it actually locked up my desktop (ran out of memory), forcing me to reboot, and killed my mprime P-1 job on my new 64 GB RAM laptop (same reason), so I had to make the necessary trimming in the standard Unix line editor ed (which still took up over 6 GB of RAM even with no visual display). I even wrote a lament about it (based on the theme song to The Brady Bunch).

As for the issue of stepping on people's toes, I always reserve sequences I work on if they're over n=50k. Below that, it only takes a few hours on my slowest computer, so it's not usually necessary.

Thank you for the reply!

I can't make much sense of the file names in your link above. Most are from 2017. I take it these have not been ran?

I wouldn't think you would be having problems with 64GB or RAM. I can open any of the archives and view the details with 16GB of RAM on my Windows 10 machine. You mention running a server of some type. If this is on the same system, then it may be using up a lot of RAM.

The k=6927 sieve I started two days ago is complete. 19,214 terms remaining from 400e3 to1e6. Since I have the sieve, I might as well run it with LLR. I have two separate folders, one for running and the other for checking for twins. I will have to study the batch files I wrote to get it right. As I wrote, this Xeon sits in a corner mostly unnoticed. I have ran Prime95 on it for weeks without turning the monitor on. It can do the job.

[VBCurtis]

Originally Posted by storm5510

The k=6927 sieve I started two days ago is complete. 19,214 terms remaining from 400e3 to1e6. Since I have the sieve, I might as well run it with LLR.

If you are aware of the PrimeGrid sieve files (you are, since you just commented that you can open them on your 16GB machine), why are you running your own sieve to less than 0.1% of the sieve depth of a sieve file you already have possession of?

Let's say you made the sieve just to see if you knew how to do it- fine. But now you're going to run your own sieve file through LLR, when you already have a PrimeGrid file sieved to something like 1e17 for the same k-value?

Or, is this a case where you have no idea what you're talking about when you say "I can open any of the archives," and aren't actually aware of the sieve files Happy is referring to?

[storm5510]

Originally Posted by VBCurtis

If you are aware of the PrimeGrid sieve files (you are, since you just commented that you can open them on your 16GB machine), why are you running your own sieve to less than 0.1% of the sieve depth of a sieve file you already have possession of?

Let's say you made the sieve just to see if you knew how to do it- fine. But now you're going to run your own sieve file through LLR, when you already have a PrimeGrid file sieved to something like 1e17 for the same k-value?

Or, is this a case where you have no idea what you're talking about when you say "I can open any of the archives," and aren't actually aware of the sieve files Happy is referring to?

I think you really enjoy telling me that I do not know what I am talking about! This is not the first time...

I will refer to the image attachments below. The first is WinRAR. It shows one of archives from Happy's link open without the need to download it.

The second is the contents of the archive in WinRAR's viewer, still without the need to download it.

The third is Notepad++ with the contents of the ABCD file visible after I actually downloaded it. The file contains over 4,400,000 lines.

Is this sufficient, or do you need more???

[kar_bon]

To give more hints:
- the link Happy given is the thread, so you have to go to the last post in it from 2021-01-19 (although the suspended sieves didn't changed since then in the first post)
- next download rsp1M_20150702.abcd (suspended sieves): this file contains all sieves for Riesel 3<k<10000 and n<1M
- copy in a directory, unzip it and use srfile.exe to call:
srfile -g rsp1M_20150702.abcd
(output looks: Read 145955447 terms for 4998 sequences from ABCD format file `rsp1M_20150702.abcd'.)
to create every sieve file for all k's separately
- grap the t17_b2_k6927.npg to use this as input for LLR
it contains 23784 n-values <1M for k=6927

For higher n-values use the "rsp2M_xxx", "rsp3M_xxx" and so on.