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Forum: Miscellaneous Math 2020-11-25, 09:13
Replies: 10
Views: 132
Posted By paulunderwood
The GIMPS softwares prime95/mprime and gpuOwl do...

The GIMPS softwares prime95/mprime and gpuOwl do P-1. There are some other softwares specifically for division tests. This site has some details: mersenne.ca (https://www.mersenne.ca/)
Forum: Miscellaneous Math 2020-11-25, 07:26
Replies: 10
Views: 132
Posted By paulunderwood
Yes! join GIMPS and look for 100 million digit...

Yes! join GIMPS and look for 100 million digit Mersenne primes, although this a daunting task at the moment. To test a single Mersenne at this size takes a few weeks on a Radeon VII GPU.
Forum: Miscellaneous Math 2020-11-25, 06:50
Replies: 10
Views: 132
Posted By paulunderwood
Even after you have done what I said to find a...

Even after you have done what I said to find a PRP or PRP twin, you would need to live for millions of years and utilise the power of a star in order to prove them prime.
Forum: Miscellaneous Math 2020-11-25, 06:13
Replies: 10
Views: 132
Posted By paulunderwood
Get one of these top500 computers...

Get one of these top500 computers (https://www.top500.org/lists/top500/2020/11/)

Upgrade you household electricity system to handle up to 30 megawatts

Build a power station nearby

Use...
Forum: Hardware 2020-11-24, 21:26
Replies: 103
Views: 5,800
Posted By paulunderwood
Hmm. The installation did not work through this...

Hmm. The installation did not work through this "front" usb socket. Maybe the socket is at fault. Can you try the wifi stick in another socket? Maybe the one in which you did the installation. .
Forum: Five or Bust - The Dual Sierpinski Problem 2020-11-24, 17:21
Replies: 8
Views: 312
Posted By paulunderwood
I have an experimental version of Primo :devil:

I have an experimental version of Primo :devil:
Forum: Hardware 2020-11-24, 11:37
Replies: 10
Views: 589
Posted By paulunderwood
Thanks for the offer, but I want to concentrate...

Thanks for the offer, but I want to concentrate on RISC-V for now -- that is complicated enough! I like the way every thing is open, with architecture diagrams etc. I will be reading my RISC-V book...
Forum: Hardware 2020-11-23, 23:57
Replies: 103
Views: 5,800
Posted By paulunderwood
Unfortunately I don't have wifi to test it out. ...

Unfortunately I don't have wifi to test it out.

I think we are at a chicken and eggs situation. You might need to install wpa_supplicant as suggest by Xyzzy. This impasse will be overcome by using...
Forum: Hardware 2020-11-23, 10:50
Replies: 10
Views: 589
Posted By paulunderwood
Smile My Longan Nano arrived today. Now I can start...

My Longan Nano arrived today. Now I can start debugging my arbitrary arithmetic code. I have a RISC-V book on order -- the one with a picture of Mona Lisa on the front.

Edit: I now need a usb-c...
Forum: Hardware 2020-11-23, 01:48
Replies: 103
Views: 5,800
Posted By paulunderwood
Alternatively, just add DNS1=1.1.1.1 to...

Alternatively, just add DNS1=1.1.1.1 to ifcfg-wlp0s20u3 and then run systemctl restart NetworkManager.service

You should now be able to ping yahoo.com and be able to install "Server with GUI" and...
Forum: Hardware 2020-11-22, 20:47
Replies: 103
Views: 5,800
Posted By paulunderwood
Try this command as root: nmtui and "activate"...

Try this command as root: nmtui and "activate" the wireless device. (Ref (https://www.techrepublic.com/article/how-to-easily-edit-a-network-connection-on-a-centos-7-minimal-installation/)). But it...
Forum: Hardware 2020-11-22, 08:05
Replies: 103
Views: 5,800
Posted By paulunderwood
See this link:...

See this link: https://www.krizna.com/centos/setup-network-centos-7/

I am running Centos8 under qemu installed from the same iso...

I ran:

nmcli d to get a list of "nic cards".

As root, I...
Forum: Hardware 2020-11-21, 23:51
Replies: 103
Views: 5,800
Posted By paulunderwood
You can specify an older driver in the...

You can specify an older driver in the /etc/apt/source.list.d/rocm.list file by changing "debian" to a version number.
Forum: Hardware 2020-11-21, 22:46
Replies: 103
Views: 5,800
Posted By paulunderwood
I don't think so, but it might be worth a try --...

I don't think so, but it might be worth a try -- you should be using workstation??

Try, as per instructions:

dnf grouplist

you should see "Server with GUI" if that concurs with what you have...
Forum: Hardware 2020-11-21, 22:18
Replies: 103
Views: 5,800
Posted By paulunderwood
https://www.golinuxcloud.com/install-gnome-enable-...

https://www.golinuxcloud.com/install-gnome-enable-gui-mode-rhel-centos-8/
Forum: Miscellaneous Math 2020-11-20, 08:13
Replies: 21
Views: 532
Posted By paulunderwood
bound=100000000000*E I don't know MMA.

bound=100000000000*E

I don't know MMA.
Forum: Miscellaneous Math 2020-11-20, 02:20
Replies: 21
Views: 532
Posted By paulunderwood
You could have done n%100==63 instead. ...

You could have done n%100==63 instead.

Anyway thanks.

With the counterexample [62611454518799, 9] I need to go back to the drawing board.

I had a PM for Dr. Sardonicus, wherein he describes...
Forum: Miscellaneous Math 2020-11-19, 15:40
Replies: 21
Views: 532
Posted By paulunderwood
For a=5: [17310451593311, 5] ...

For a=5:

[17310451593311, 5]

gcd(p-1,q-1) = 10*17*4079

a=6 seems to be special case.

I will continue to a=10 and if no other counterexamples turn up, concentrate on a=7
Forum: Miscellaneous Math 2020-11-19, 08:06
Replies: 21
Views: 532
Posted By paulunderwood
Results for a=4: [68368998319, 4] ...

Results for a=4:

[68368998319, 4]
[416032697359, 4]
[4752200398399, 4]

All semi-primes, p*q, where gcd(p-1,q-1)=2^i*3^j
Forum: Hardware 2020-11-19, 02:57
Replies: 103
Views: 5,800
Posted By paulunderwood
This person claims to have "fixed the problem" ...

This person claims to have "fixed the problem"

https://forums.centos.org/viewtopic.php?t=63043

by running dracut -f in rescue(?) mode. He might have meant emergency mode,
...
Forum: Miscellaneous Math 2020-11-18, 20:17
Replies: 21
Views: 532
Posted By paulunderwood
What have the romans ever done for us?

[177655186463, 3]
[286748218763, 3]
[340473667463, 3]

I will update as they are found.
Forum: Miscellaneous Math 2020-11-18, 14:48
Replies: 21
Views: 532
Posted By paulunderwood
I ran that up tp a=100, No new pseudoprimes. ...

I ran that up tp a=100, No new pseudoprimes.

I am now looping heavily over a with a shallow inner loop.

After I will hammer a=3 to 10 to see if I can find another pseudoprime.

It is...
Forum: Miscellaneous Math 2020-11-18, 04:12
Replies: 21
Views: 532
Posted By paulunderwood
It was a legacy contruction from hacking together...

It was a legacy contruction from hacking together the code, To be more efficient by far I should pre-calculate 50000000*E in the second loop!

Another speed up might be had be putting...
Forum: Miscellaneous Math 2020-11-17, 22:43
Replies: 21
Views: 532
Posted By paulunderwood
On second thoughts, maybe I should! I found this...

On second thoughts, maybe I should! I found this counterexample for a=4: n=68368998319.

a even means gcd(D,E)>1.

Anyway I am re-running with some higher bounds.
Forum: Miscellaneous Math 2020-11-17, 22:18
Replies: 21
Views: 532
Posted By paulunderwood
I don't think your rearrangement of my code is...

I don't think your rearrangement of my code is the same!
Showing results 1 to 25 of 1000

 
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