mersenneforum.org  

Go Back   mersenneforum.org > Search Forums

Showing results 1 to 25 of 1000
Search took 0.35 seconds.
Search: Posts Made By: paulunderwood
Forum: PrimeNet 2022-01-27, 04:16
Replies: 25
Views: 1,368
Posted By paulunderwood
I wish these w:censored:s would go away, but I...

I wish these w:censored:s would go away, but I think some ingenuity by our best brains can come up with a (block-chain) solution like PRP results.
Forum: Miscellaneous Math 2022-01-25, 16:43
Replies: 2
Views: 95
Posted By paulunderwood
You can't. You could overclock your system with...

You can't. You could overclock your system with some resulting failure rate.

Trial factoring is best left to GPUs (graphics cards). Use your CPU (base computer) to do certifiable PRP tests. This...
Forum: Miscellaneous Math 2022-01-25, 16:33
Replies: 2
Views: 95
Posted By paulunderwood
Moderator notice: please stop posting to "News"...

Moderator notice: please stop posting to "News" with your naive questions. Failure to do so will result in a ban.
Forum: Miscellaneous Math 2022-01-24, 21:28
Replies: 16
Views: 401
Posted By paulunderwood
https://primes.utm.edu/notes/proofs/a_pseudoprimes...

https://primes.utm.edu/notes/proofs/a_pseudoprimes.html shows how to construct base-a pseudoprimes.

https://www.fq.math.ca/Scanned/41-4/chen.pdf and...
Forum: And now for something completely different 2022-01-24, 19:21
Replies: 97
Views: 28,222
Posted By paulunderwood
With some trickery I could farm out all of the...

With some trickery I could farm out all of the phase 2 work units to the cloud and run them all in parallel.
Forum: And now for something completely different 2022-01-24, 19:05
Replies: 97
Views: 28,222
Posted By paulunderwood
R49081 is in phase 2. The certification page...

R49081 is in phase 2. The certification page shows one slight change after more than 3 days. Marcel Martin, Primo author, warned me of the lengthy tasks of phase 2 at ~49k digits. Therefore, expect a...
Forum: Tales From the Crypt(o) 2022-01-21, 08:33
Replies: 287
Views: 98,918
Posted By paulunderwood
Should the $2 trillion company Apple be allowed...

Should the $2 trillion company Apple be allowed to sell AirTags in the light that they can be used to stalk and ultimately rape women?
Forum: FactorDB 2022-01-20, 19:39
Replies: 170
Views: 53,996
Posted By paulunderwood
I found log^4 is a good rule of thumb. Have you...

I found log^4 is a good rule of thumb. Have you selected max settings on the certification page? 11k dd? (?). Things will speed up! I know it can be disheartening to watch it backtrack, A watched...
Forum: Riesel Prime Search 2022-01-20, 16:54
Replies: 301
Views: 54,133
Posted By paulunderwood
Sniped again! Congrats to Ryan Propper for the...

Sniped again! Congrats to Ryan Propper for the factorial prime 308084! + 1 (https://primes.utm.edu/primes/page.php?id=133196) (1,557,176 decimal digits) :banana:
Forum: Riesel Prime Search 2022-01-18, 23:36
Replies: 301
Views: 54,133
Posted By paulunderwood
Congrats to PrimeGrid for the "321" prime...

Congrats to PrimeGrid for the "321" prime 3*2^18196595 - 1 (https://primes.utm.edu/primes/page.php?id=133193) (5,477,722 decimal digits, rank 20) :banana:
Forum: Hardware 2022-01-18, 13:09
Replies: 99
Views: 11,307
Posted By paulunderwood
I have a spare original AMD 1090t CPU fan and...

I have a spare original AMD 1090t CPU fan and heat sink that has not been used much at all as I went for an after market one. It just needs locating in a box and I am willing to post it to you...
Forum: Programming 2022-01-17, 20:19
Replies: 13
Views: 500
Posted By paulunderwood
Nice one. :tu: I had narrowed it down to a...

Nice one. :tu: I had narrowed it down to a problem with SOE.
Forum: Riesel Prime Search 2022-01-17, 13:16
Replies: 76
Views: 29,437
Posted By paulunderwood
Another smaller one: 69 * 2^13832885 - 1...

Another smaller one: 69 * 2^13832885 - 1 (https://primes.utm.edu/primes/page.php?id=133178) (4,164,116 decimal digits) :banana:
Forum: Programming 2022-01-17, 12:18
Replies: 13
Views: 500
Posted By paulunderwood
primes[] is assigned 0 and 1 which are 4 bytes --...

primes[] is assigned 0 and 1 which are 4 bytes -- char is 1 byte.

To save save memory space the coder could use char and assign and test '0' and '1'. Or use a smaller integer type.
Forum: Programming 2022-01-17, 08:08
Replies: 13
Views: 500
Posted By paulunderwood
I changed to primes = malloc(sizeof(int) *...

I changed to primes = malloc(sizeof(int) * sieve_depth); and now get no errors
Forum: Programming 2022-01-17, 07:39
Replies: 13
Views: 500
Posted By paulunderwood
I get "corrupted size vs. prev_size" which means...

I get "corrupted size vs. prev_size" which means you have a memory leak somewhere caused by out-of-bounds access.
Forum: Programming 2022-01-17, 06:26
Replies: 13
Views: 500
Posted By paulunderwood
gcc -v Using built-in specs. COLLECT_GCC=gcc ...

gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target:...
Forum: Programming 2022-01-16, 22:12
Replies: 13
Views: 500
Posted By paulunderwood
How is index controlled? It might be easier...

How is index controlled?

It might be easier to debug if you attached the whole program.
Forum: Hardware 2022-01-16, 17:47
Replies: 99
Views: 11,307
Posted By paulunderwood
:lol: I guess it is an after market fan because...

:lol: I guess it is an after market fan because the originals scream a bit under full load. Have you considered replacing the fan component?
Forum: XYYXF Project 2022-01-15, 22:42
Replies: 487
Views: 110,814
Posted By paulunderwood
Congrats! No. PFGW ran successfully...

Congrats!



No. PFGW ran successfully with a bigger FFT size using -a1 :smile:
Forum: Probability & Probabilistic Number Theory 2022-01-15, 16:57
Replies: 15
Views: 3,282
Posted By paulunderwood
I can now clarify. Take the example n=2499327041...

I can now clarify. Take the example n=2499327041 with 30258 P <= (n-1)/2 values that give rise to counterexamples. The multiplicative order of 2 is 560 meaning a single 2^r solution would give rise...
Forum: Forum Feedback 2022-01-13, 15:22
Replies: 23
Views: 678
Posted By paulunderwood
Firefox too, but it is an attachment!

Firefox too, but it is an attachment!
Forum: Hardware 2022-01-13, 15:11
Replies: 27
Views: 6,876
Posted By paulunderwood
For wavefront Mersenne testing, the 3990x is best...

For wavefront Mersenne testing, the 3990x is best suited to running 8 workers -- there are 8 chiplets in this architecture. Only for huge FFT work does it make sense to use fewer workers.
Forum: Hardware 2022-01-11, 15:38
Replies: 25
Views: 893
Posted By paulunderwood
PFGW, like all GWNUM-based software, benefits...

PFGW, like all GWNUM-based software, benefits from AVX2 which the Celeron chip lacks.
Forum: Riesel Prime Search 2022-01-10, 22:39
Replies: 301
Views: 54,133
Posted By paulunderwood
Sniped! :snipe:

Sniped! :snipe:
Showing results 1 to 25 of 1000

 
All times are UTC. The time now is 00:20.


Fri Jan 28 00:20:04 UTC 2022 up 188 days, 18:49, 3 users, load averages: 1.50, 1.51, 1.42

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.

≠ ± ∓ ÷ × · − √ ‰ ⊗ ⊕ ⊖ ⊘ ⊙ ≤ ≥ ≦ ≧ ≨ ≩ ≺ ≻ ≼ ≽ ⊏ ⊐ ⊑ ⊒ ² ³ °
∠ ∟ ° ≅ ~ ‖ ⟂ ⫛
≡ ≜ ≈ ∝ ∞ ≪ ≫ ⌊⌋ ⌈⌉ ∘ ∏ ∐ ∑ ∧ ∨ ∩ ∪ ⨀ ⊕ ⊗ 𝖕 𝖖 𝖗 ⊲ ⊳
∅ ∖ ∁ ↦ ↣ ∩ ∪ ⊆ ⊂ ⊄ ⊊ ⊇ ⊃ ⊅ ⊋ ⊖ ∈ ∉ ∋ ∌ ℕ ℤ ℚ ℝ ℂ ℵ ℶ ℷ ℸ 𝓟
¬ ∨ ∧ ⊕ → ← ⇒ ⇐ ⇔ ∀ ∃ ∄ ∴ ∵ ⊤ ⊥ ⊢ ⊨ ⫤ ⊣ … ⋯ ⋮ ⋰ ⋱
∫ ∬ ∭ ∮ ∯ ∰ ∇ ∆ δ ∂ ℱ ℒ ℓ
𝛢𝛼 𝛣𝛽 𝛤𝛾 𝛥𝛿 𝛦𝜀𝜖 𝛧𝜁 𝛨𝜂 𝛩𝜃𝜗 𝛪𝜄 𝛫𝜅 𝛬𝜆 𝛭𝜇 𝛮𝜈 𝛯𝜉 𝛰𝜊 𝛱𝜋 𝛲𝜌 𝛴𝜎 𝛵𝜏 𝛶𝜐 𝛷𝜙𝜑 𝛸𝜒 𝛹𝜓 𝛺𝜔