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Forum: Five or Bust - The Dual Sierpinski Problem 2020-11-24, 17:21
Replies: 7
Views: 259
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: 565
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: 97
Views: 5,606
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: 565
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: 97
Views: 5,606
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: 97
Views: 5,606
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: 97
Views: 5,606
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: 97
Views: 5,606
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: 97
Views: 5,606
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: 97
Views: 5,606
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: 524
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: 524
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: 524
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: 524
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: 97
Views: 5,606
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: 524
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: 524
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: 524
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: 524
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: 524
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!
Forum: Miscellaneous Math 2020-11-17, 22:16
Replies: 21
Views: 524
Posted By paulunderwood
No. "n" is the number tested, although I do not...

No. "n" is the number tested, although I do not see how to make it an argument of a function.
Forum: Miscellaneous Math 2020-11-17, 19:07
Replies: 21
Views: 524
Posted By paulunderwood
w00t 1+1 Selfridges PRP test

This script outputs no counterexamples:


{
forstep(a=3,100,1,print(a);
D=a^2-4;E=D^2-4;
forstep(n=4*E-1,50000000*E,4*E,
if(kronecker(D,n)==-1&&!ispseudoprime(n),...
Forum: Wagstaff PRP Search 2020-11-17, 18:28
Replies: 405
Views: 43,933
Posted By paulunderwood
Unknown. We tested up to 10^7. Ryan worked...

Unknown. We tested up to 10^7. Ryan worked independently to find the two records.
Forum: GPU to 72 2020-11-17, 05:50
Replies: 5
Views: 267
Posted By paulunderwood
Congrats! However: ?...

Congrats! However:

? factor(499400852887245323683941126088449355702834653807158087 )

[ 290582744822559701357207 1]

[1718618403140893608084889221841 1]
Forum: Lounge 2020-11-15, 19:50
Replies: 1,542
RIP
Views: 110,512
Posted By paulunderwood
This is quite a good docu-drama of his offences...

This is quite a good docu-drama of his offences and eventual capture:

lc7WsYSqrzA
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