mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Data > mersenne.ca

Reply
 
Thread Tools
Old 2022-01-20, 16:11   #793
James Heinrich
 
James Heinrich's Avatar
 
"James Heinrich"
May 2004
ex-Northern Ontario

2×11×132 Posts
Default

Quote:
Originally Posted by Zhangrc View Post
Suggestion: Show "MISSED FACTOR!" in P-1 results too
Thanks for the suggestion, implemented.
James Heinrich is offline   Reply With Quote
Old 2022-01-20, 16:27   #794
kruoli
 
kruoli's Avatar
 
"Oliver"
Sep 2017
Porta Westfalica, DE

17308 Posts
Default

Quote:
Originally Posted by VBCurtis View Post
Can you give us an example of an exponent where you think the original P-1 work missed the factor, and the bounds for the previous P-1?
Concrete example, found with James's tool: M13258937.ca.
kruoli is offline   Reply With Quote
Old 2022-01-20, 16:29   #795
axn
 
axn's Avatar
 
Jun 2003

536610 Posts
Default

Quote:
Originally Posted by VBCurtis View Post
Can you give us an example of an exponent where you think the original P-1 work missed the factor, and the bounds for the previous P-1? It's more likely you found factors with bigger bounds than all 4 of your finds would have been found by the old bounds.
There has been a shockingly large number of P-1 misses that I've found as part of <20M project

27.0 - https://www.mersenne.ca/p1missed.php...0&max=27100000 - anything 75+ bits is found by me where the previous P-1 should've found
19.5 - https://www.mersenne.ca/p1missed.php...0&max=19600000 - anything 73+ bit is found by me via P-1 or by TF (not me) recently. I am not yet done with 19.5, so more could get uncovered.

The original P-1 were all done way back around 2003 or so. Nonetheless, it is disturbingly large amount of bad P-1.
axn is offline   Reply With Quote
Old 2022-01-20, 17:22   #796
Luminescence
 
Oct 2021
Germany

22·52 Posts
Default

Quote:
Originally Posted by James Heinrich View Post
Thanks for the suggestion, implemented.
Maybe a bug? 10480469 shows a missed factor, but this P-1 test has probably been run with the known factor since it was done after SRBase found it
Luminescence is offline   Reply With Quote
Old 2022-01-20, 17:29   #797
masser
 
masser's Avatar
 
Jul 2003
Behind BB

31·61 Posts
Default

Missed P-1 factors discussed frequently here.

TL;DR: Early results (say pre-2003) aren't necessarily reliable.

Last fiddled with by masser on 2022-01-20 at 17:30
masser is offline   Reply With Quote
Old 2022-01-20, 17:51   #798
VBCurtis
 
VBCurtis's Avatar
 
"Curtis"
Feb 2005
Riverside, CA

2×5×232 Posts
Default

Quote:
Originally Posted by James Heinrich View Post
Wow, that's a lot of missed factors!

Thanks for the corrections, and sorry to suggest Zhang was mistaken.
VBCurtis is offline   Reply With Quote
Old 2022-01-20, 18:09   #799
axn
 
axn's Avatar
 
Jun 2003

2·2,683 Posts
Default

Quote:
Originally Posted by axn View Post
I am not yet done with 19.5, so more could get uncovered.
Hot off the press - 19552763
axn is offline   Reply With Quote
Old 2022-01-20, 19:29   #800
nordi
 
Dec 2016

23·3·5 Posts
Default

The "Missed Factor" feature seems to still be a bit buggy:

https://www.mersenne.ca/exponent/12133333
Those newly discovered factores require larger B2 values than 400k, so they were not missed by the P-1 run with B1=B2=400,000.

https://www.mersenne.ca/exponent/726064763
The TF/P-1 that got flagged was done after the respective factors were discovered.
nordi is offline   Reply With Quote
Old 2022-01-20, 19:44   #801
James Heinrich
 
James Heinrich's Avatar
 
"James Heinrich"
May 2004
ex-Northern Ontario

E8616 Posts
Default

Quote:
Originally Posted by nordi View Post
The TF/P-1 that got flagged was done after the respective factors were discovered.
I have changed the code to only flag as "MISSED FACTOR" where the P-1 run was done before discovery date of the factor in question. Ctrl-F5 may be needed to refresh pages you've already looked at recently.
Quote:
Originally Posted by nordi View Post
Those newly discovered factores require larger B2 values than 400k, so they were not missed by the P-1 run with B1=B2=400,000.
If you mouse-over any "MISSED FACTOR" text you'll see the first (smallest) factor the code has noticed should have been found.
James Heinrich is offline   Reply With Quote
Old 2022-01-20, 20:12   #802
nordi
 
Dec 2016

23·3·5 Posts
Default

Quote:
Originally Posted by James Heinrich View Post
I have changed the code to only flag as "MISSED FACTOR" where the P-1 run was done before discovery date of the factor in question.
Thanks, looks much better now! 726064763 still has false positives for TF, though.
nordi is offline   Reply With Quote
Old 2022-01-20, 21:22   #803
James Heinrich
 
James Heinrich's Avatar
 
"James Heinrich"
May 2004
ex-Northern Ontario

2×11×132 Posts
Default

Quote:
Originally Posted by nordi View Post
Thanks, looks much better now! 726064763 still has false positives for TF, though.
Not false positives, the result clearly says no factor from 2^82 to 2^83 and there is a known 82.568-bit factor. How else am I supposed to interpret this?
If the user did indeed factor from 82-83 complete and did not stop after finding the factor, the it should be reported as a completed TF-F run, with factor, not as TF-NF.
James Heinrich is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Small inconsistencies between mersenne.org and mersenne.ca factor databases GP2 mersenne.ca 44 2016-06-19 19:29
mersenne.ca (ex mersenne-aries.sili.net) LaurV mersenne.ca 8 2013-11-25 21:01
Gaussian-Mersenne & Eisenstein-Mersenne primes siegert81 Math 2 2011-09-19 17:36
Mersenne Wiki: Improving the mersenne primes web site by FOSS methods optim PrimeNet 13 2004-07-09 13:51

All times are UTC. The time now is 01:07.


Sat May 28 01:07:16 UTC 2022 up 43 days, 23:08, 0 users, load averages: 1.86, 1.67, 1.68

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 𝛴𝜎𝜍 𝛵𝜏 𝛶𝜐 𝛷𝜙𝜑 𝛸𝜒 𝛹𝜓 𝛺𝜔