mersenneforum.org  

Go Back   mersenneforum.org > Search Forums

Showing results 1 to 25 of 255
Search took 0.04 seconds.
Search: Posts Made By: fatphil
Forum: Puzzles 2022-10-18, 07:21
Replies: 78
Views: 9,117
Posted By fatphil
Props from the old guard! And thanks Andreas for...

Props from the old guard! And thanks Andreas for the PM notification.

I can't find the latest version of my code, alas (but do still have a compiled 32-bit Athlon binary, and source for the...
Forum: Miscellaneous Math 2022-09-01, 14:43
Replies: 23
Views: 1,694
Posted By fatphil
Thanks for this, I'm a bit rusty, and it will...

Thanks for this, I'm a bit rusty, and it will take several re-reads to sink in. I wish I had the mastery of Pari/GP I used to, so I could play around with these 2-dimensional objects - I'd completely...
Forum: Miscellaneous Math 2022-08-29, 17:59
Replies: 23
Views: 1,694
Posted By fatphil
In that case all of them will be divisible by...

In that case all of them will be divisible by smaller Lucas numbers, and therefore none can be prime.

Congrats, you've solved the first half of the conjecture!

Edit: how did you work out it was...
Forum: Miscellaneous Math 2022-08-29, 16:11
Replies: 23
Views: 1,694
Posted By fatphil
Now I've worked out the algebraic structure,...

Now I've worked out the algebraic structure, these are just a^n+b^n and a^n-b^n sequences. I don't think there's any need to hunt for factors any more, at least on the numerator side, but I'll...
Forum: Miscellaneous Math 2022-08-29, 14:08
Replies: 23
Views: 1,694
Posted By fatphil
It's nice when things drop out just at the ideal...

It's nice when things drop out just at the ideal moment. For instance, I was just about to give up on this number:

Run 100 out of 100:
Using B1=10315491, B2=10315490-35133066160, polynomial...
Forum: Miscellaneous Math 2022-08-29, 07:40
Replies: 23
Views: 1,694
Posted By fatphil
Wow - thanks! Gmp-ecm never stops impressing me....

Wow - thanks! Gmp-ecm never stops impressing me. I'm beginning to regret my strategy of starting with a small B1, I'm still on my 174th failing curve with B1 up to 35000...
I don't think I'll bother...
Forum: Miscellaneous Math 2022-08-28, 17:07
Replies: 23
Views: 1,694
Posted By fatphil
Just updated with some info about the direction I...

Just updated with some info about the direction I headed in, so you don't need to reinvent the wheel. It looks like I may have to reinvent some of my factors, as I can't find the window I was working...
Forum: Miscellaneous Math 2022-08-28, 15:49
Replies: 23
Views: 1,694
Posted By fatphil
I didn't do P+/-1 because I was prepared to just...

I didn't do P+/-1 because I was prepared to just let ECM run, and with 100 curves, now 125, the Hasse coverage should have pulled out something that was in range of P+/-1. By the time I was hitting...
Forum: Miscellaneous Math 2022-08-28, 12:39
Replies: 23
Views: 1,694
Posted By fatphil
Life's good, all considering, he says as he runs...

Life's good, all considering, he says as he runs off to check if the rain has breached the flashing on the roof again, and started to drip into the sauna...

I've pushed forward as far as I can,...
Forum: Miscellaneous Math 2022-08-27, 08:15
Replies: 23
Views: 1,694
Posted By fatphil
Dang, looks like the X clipboard craps out at...

Dang, looks like the X clipboard craps out at 4096 characters. I'll stick the next number on a webpage if I need help again.

As I make progress, it looks like I only need 1 factor per term, and...
Forum: Miscellaneous Math 2022-08-26, 15:37
Replies: 23
Views: 1,694
Posted By fatphil
Can I borrow some ECM of a friendly CPU?

Working on something a bit cranky at the moment, where the act of discovery is the main pleasure, hence my secrecy, I'd rather not be spoiled - I'll post here more about it when I've run out of easy...
Forum: Puzzles 2022-02-24, 09:35
Replies: 13
Views: 2,350
Posted By fatphil
I think I was standing on my head, and completely...

I think I was standing on my head, and completely misunderstood you. Despite what you saying being both clear and correct. The error is entirely mine, apologies.
Forum: Puzzles 2022-02-24, 00:29
Replies: 13
Views: 2,350
Posted By fatphil
You have completely failed to understand the...

You have completely failed to understand the problem.
Forum: Puzzles 2022-02-24, 00:28
Replies: 13
Views: 2,350
Posted By fatphil
How does that make any sense at all??!?!

How does that make any sense at all??!?!
Forum: Puzzles 2022-02-22, 22:58
Replies: 13
Views: 2,350
Posted By fatphil
Yup, so the cards are simpler than a full...

Yup, so the cards are simpler than a full "permutation". I'd describe the final arrangement of cards as simply +2, +3, +4, +0, +1.

Note that he ends clean, so there aren't (necessarily) that many...
Forum: Puzzles 2022-02-21, 23:28
Replies: 14
Views: 1,886
Posted By fatphil
No time to compose a post, as it's past bedtime....

No time to compose a post, as it's past bedtime. However, I've just scribbled this into a 'speed.txt' file...

"""
Old code of unknown vintage. Code did get 2.5x quicker almost immediately
after...
Forum: Puzzles 2022-02-21, 23:21
Replies: 13
Views: 2,350
Posted By fatphil
Penn & Teller Fool Us, S08 E09

Andi Gladwin's maze cards, the third trick, which fooled P&T.

It's almost entirely pure mathematics. I'll try and keep the "spoilers" minimal, and thus perhaps the confusion high.

I haven't...
Forum: Puzzles 2022-02-20, 21:01
Replies: 14
Views: 1,886
Posted By fatphil
We did the n^2-1, n^2, n^2+1 test ourselves and...

We did the n^2-1, n^2, n^2+1 test ourselves and confirmed that finding. I was unable to imagine where any other corner cases might hide.
Forum: Puzzles 2022-02-20, 20:31
Replies: 14
Views: 1,886
Posted By fatphil
Should I stop my test, or should I let it just...

Should I stop my test, or should I let it just complete so that everything it misses can be known? Am I right in thinking that all results are delivered in mod M order? The last thing printed was...
Forum: Puzzles 2022-02-20, 14:21
Replies: 14
Views: 1,886
Posted By fatphil
Sounds excellent! I've just started it on a known...

Sounds excellent! I've just started it on a known range that I ran with either my mark-I or mark-II code to check that the results are the same. Alas the chunks I was testing were multi-day on...
Forum: Puzzles 2022-02-19, 21:35
Replies: 14
Views: 1,886
Posted By fatphil
Yeah, that's close enough to the problem the...

Yeah, that's close enough to the problem the olympiad video was about, which was made me realise this puzzle was just part of a family in the first place.
Forum: Puzzles 2022-02-19, 21:25
Replies: 14
Views: 1,886
Posted By fatphil
Yup, that's what I've been running with most of...

Yup, that's what I've been running with most of the time:


// the square greater or equal to a^2+b^2, and its root
uint64_t rt_ge_a2b2 = a + 1;
...
Forum: Puzzles 2022-02-17, 21:58
Replies: 14
Views: 1,886
Posted By fatphil
Simultaneously Square Sums of Mostly Squares

Late last year I came up with this puzzle, but brute force and ignorance are now beginning to stall when it comes to finding solutions, so I thought perhaps you guys would like a stab:

Find...
Forum: Lounge 2022-02-17, 20:43
Replies: 118
Views: 10,430
Posted By fatphil
rain rapid antigens invade Nevada anti

rain

rapid antigens invade Nevada

anti
Forum: Factoring 2010-06-23, 08:14
Replies: 1,870
Views: 231,472
Posted By fatphil
I notice it's been 96 hours since the last...

I notice it's been 96 hours since the last connect, so I presume
everyone is off now. If that stays the case, I'll stick this machine in
my pocket when I head over to Tallinn tomorrow evening.
...
Showing results 1 to 25 of 255

 
All times are UTC. The time now is 17:17.


Tue Dec 6 17:17:26 UTC 2022 up 110 days, 14:46, 0 users, load averages: 1.08, 1.50, 1.59

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