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Forum: Miscellaneous Math 2020-10-22, 08:31
Replies: 9
Views: 127
Posted By paulunderwood
Your code sux. Why not input the exponent? Why a...

Your code sux. Why not input the exponent? Why a huge if then else construct -- doesn't python have set inclusion? At least loop over an array. You do not use the structure of Mersennes with prime...
Forum: Lounge 2020-10-22, 03:24
Replies: 18
Views: 421
Posted By paulunderwood
Assuming you are using the latest Prime95, a...

Assuming you are using the latest Prime95, a certificate will be generated and that will be uploaded to the server. Then your computer will start the next task, be that cached or downloaded from the...
Forum: EdH 2020-10-22, 02:41
Replies: 10
Views: 92
Posted By paulunderwood
That most likely a legacy dot file -- beginning...

That most likely a legacy dot file -- beginning with "." -- in your home directory. I think is a security one. ls -a with show it. I am pretty sure if you created a new user with adduser then that...
Forum: EdH 2020-10-22, 02:13
Replies: 10
Views: 92
Posted By paulunderwood
If this question was aimed at me... My apt...

If this question was aimed at me...

My apt package manager is also broken with unmet dependencies, something to do with dkms and a kernel. I have spent many hours trying to fix apt in the past and...
Forum: EdH 2020-10-21, 22:33
Replies: 10
Views: 92
Posted By paulunderwood
I have never had any such problems with Debian....

I have never had any such problems with Debian. In fact I will be upgrading from Buster to Bullseye any day soon. Some parts of ROCm require later versions of Python. I simply change the sources...
Forum: Hardware 2020-10-20, 17:26
Replies: 8
Views: 183
Posted By paulunderwood
Try running memtest86+. You might have one or...

Try running memtest86+. You might have one or more bad sticks of RAM.

Also install a temperature monitoring software.
Forum: Software 2020-10-18, 14:09
Replies: 22
Views: 2,780
Posted By paulunderwood
Arrow Speed up for N=2^n-c

Fermat's Little theorem states b^(N-1) == 1 mod N for prime N (and gcd(b,N)==1).

For N=2^n-c this means for b=3 that 3^(2^n-c-1) == 1 (mod 2^n-c). This can be rewritten as 3^(2^n) == 3^(c+1) (mod...
Forum: Miscellaneous Math 2020-10-17, 23:57
Replies: 18
Views: 727
Posted By paulunderwood
There is now a section on Gaussian primes, but...

There is now a section on Gaussian primes, but not mod n.

CRT: I find that quite difficult.

RSA: I have written that s or t may be chosen to be small for quick encoding or quick decoding...
Forum: Miscellaneous Math 2020-10-15, 15:48
Replies: 18
Views: 727
Posted By paulunderwood
I have tried to correct and clarify the text and...

I have tried to correct and clarify the text and arguments as Nick pointed out in the previous post. I have uploaded the latest version -- Oct 15th, 2020 -- to the original post....
Forum: Lounge 2020-10-14, 12:46
Replies: 7
Views: 1,427
Posted By paulunderwood
Prof. Chris Caldwell has offered up Yahoo!...

Prof. Chris Caldwell has offered up Yahoo! primenumbers group for administration and moderation. It is a useful comms channel for news about prime numbers and would be a pity to lose it. Is anybody...
Forum: Lounge 2020-10-14, 05:55
Replies: 7
Views: 1,427
Posted By paulunderwood
It is almost gone! It closes down completely Dec...

It is almost gone! It closes down completely Dec 15, 2020.

https://uk.help.yahoo.com/kb/groups/SLN35505.html

:sm88:
Forum: Software 2020-10-12, 17:35
Replies: 22
Views: 2,780
Posted By paulunderwood
I concur: testing a million digit number on an...

I concur: testing a million digit number on an i7:

v3.8.24: 0.749 ms/it
v3.8.21: 0.688 ms/it
Forum: Miscellaneous Math 2020-10-12, 05:33
Replies: 18
Views: 727
Posted By paulunderwood
Thank you very much for taking tome to read the...

Thank you very much for taking tome to read the text. I have made some changes to my local copy but will upload after more changes.
.
I mention it now in the both the paragraph on integers and when...
Forum: Miscellaneous Math 2020-10-11, 08:40
Replies: 18
Views: 727
Posted By paulunderwood
The man in the street with a little interest in...

The man in the street with a little interest in primes and testing :grin:

Please detail what the errors are so that I can fix them.
Forum: Miscellaneous Math 2020-10-10, 22:43
Replies: 18
Views: 727
Posted By paulunderwood
I have tidied up what I want write about "The...

I have tidied up what I want write about "The Fermatian Child".

I will refrain from reposting the paper until more input from folks.
Forum: Miscellaneous Math 2020-10-10, 22:40
Replies: 18
Views: 727
Posted By paulunderwood
I have read...

I have read https://en.wikipedia.org/wiki/Imaginary_unit What would you say I should write? i is fixed to be one of the two square roots of -1?
Forum: Miscellaneous Math 2020-10-10, 13:40
Replies: 18
Views: 727
Posted By paulunderwood
Prime Numbers Book

Enjoy and criticize. It ain't no C&P but might help some. :book:

After 20 downloads, I have made the changes to typos and Mersenne data. A new copy is now uploaded.

2 More downloads and I have...
Forum: Miscellaneous Math 2020-10-06, 00:38
Replies: 106
Views: 9,792
Posted By paulunderwood
A slight variation for x^2-y

Instead of using base x+1 choose to use base x+2. Then the test is, with any y=2^r-1, for non-square odd n:

find jacobi(y,n)==-1

then test

2^(n-1) == 1 (mod n)
y^((n-1)/2)==-1 (mod n)...
Forum: Soap Box 2020-10-05, 19:00
Replies: 13
Views: 297
Posted By paulunderwood
Happiness Is a Warm Gun. :bang: :bang:

Happiness Is a Warm Gun. :bang: :bang:
Forum: Software 2020-10-05, 17:30
Replies: 447
Sticky: Prime95 v30.3
Views: 25,794
Posted By paulunderwood
You could cancel your current Ubuntu LL...

You could cancel your current Ubuntu LL assignments through mersenne.org and request fresh PRP work.
Forum: Software 2020-10-04, 23:30
Replies: 6
Views: 219
Posted By paulunderwood
I don't know about 12 core chips running LLR, but...

I don't know about 12 core chips running LLR, but generally it makes sense to run 1 instance per chip or chiplet.
Forum: jvang 2020-10-04, 17:23
Replies: 19
Views: 570
Posted By paulunderwood
When you see iteration times of gpuOwl on a...

When you see iteration times of gpuOwl on a Radeon VII drop dramatically with memory overclocking without result degradation, you have to ask yourself "why not?". :smile:
Forum: Software 2020-10-03, 21:38
Replies: 6
Views: 219
Posted By paulunderwood
Running only one instance has all the cache too...

Running only one instance has all the cache too itself and will run quicker than running two instances where there will be contention for cache. On a 4c/8t box I run on instance with the -t4 option....
Forum: Number Theory Discussion Group 2020-10-03, 08:49
Replies: 4
Views: 263
Posted By paulunderwood
2^p - 1 == 0 mod Mp 2^p == 1 mod Mp k*2^p ==...

2^p - 1 == 0 mod Mp
2^p == 1 mod Mp
k*2^p == k mod Mp
That is k shifted to the left p-bits is equivalent to k.

If a and b each have no more than p bits then a*b is at most 2*p-1 bits, you can...
Forum: And now for something completely different 2020-10-02, 14:52
Replies: 5
Views: 314
Posted By paulunderwood
There may be some low hanging fruit in the masses...

There may be some low hanging fruit in the masses of data in factorDB, for you to practice some ECM/CHG/KP on. Perhaps some one else can give pointers to likely numbers
Showing results 1 to 25 of 1000

 
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