mersenneforum.org

mersenneforum.org (https://www.mersenneforum.org/index.php)
-   Lone Mersenne Hunters (https://www.mersenneforum.org/forumdisplay.php?f=12)
-   -   Found a factor, sunshine? Embalm and entomb it here! (RU "Выкрасить и выбросить")) (https://www.mersenneforum.org/showthread.php?t=13977)

VBCurtis 2021-12-17 16:33

[QUOTE=bur;595463].... I chose that relatively large B1 because I didn't want someone else to have to go over the same range again in 5 years with incrased B1.[/QUOTE]

This has been my logic, too. The existence of smaller factors / factors that could have been found with smaller bounds shouldn't change your attitude, imo. Do it once, do it right!

xilman 2021-12-17 17:50

[QUOTE=petrw1;593778]Been there.
Over 56,000 attempts I average a factor every 30 or 40 but have seen stretches as high as 373 with no factor....and every time I have a bad stretch I still want to suspect the hardware....then they snap out of it and make up for lost time.

Patience is a virtue. :whistle:[/QUOTE]Poisson could have told you that ...

One man's fish is another man's poisson.

bur 2021-12-17 18:23

[QUOTE=VBCurtis;595498]This has been my logic, too. The existence of smaller factors / factors that could have been found with smaller bounds shouldn't change your attitude, imo. Do it once, do it right![/QUOTE]Yea, you're right, I just prepared a worktodo.add with just pfactor for a faster turnover, but I'll revert it to B1=2M... ;)

Batalov 2021-12-17 21:45

[QUOTE=xilman;595506]One man's fish is another man's poisson.[/QUOTE]
Also, one man's [I]gift [/I]is another man's poison.

storm5510 2021-12-21 00:25

ECM found a factor in curve #3, stage #2. Sigma=6233557776964751, B1=250000, B2=23250000.

M697397 has a factor: 9063851744869270329116505270383 (ECM curve 3, B1=250000, B2=23250000)

It has been quite a while since I found one of these. I cannot use the bit calculator on [I]mersenne.ca[/I]. It keeps disappearing when I hover over the box. Oh well.

Dr Sardonicus 2021-12-21 02:28

[QUOTE=storm5510;595788]ECM found a factor in curve #3, stage #2. Sigma=6233557776964751, B1=250000, B2=23250000.

M697397 has a factor: 9063851744869270329116505270383 (ECM curve 3, B1=250000, B2=23250000)

It has been quite a while since I found one of these. I cannot use the bit calculator on [I]mersenne.ca[/I]. It keeps disappearing when I hover over the box. Oh well.[/QUOTE]
Number of bits in the positive integer N is

1 + floor(log(N)/log(2))

In Pari-GP, you can also use

#binary(N)

[code]? #binary(9063851744869270329116505270383)
%1 = 103[/code]

Nice find!

[b]EDIT:[/b] An alternate interpretation of "bits" is simply log(N)/log(2).[code]? log(9063851744869270329116505270383)/log(2)
%1 = 102.83796711017436436382918177786544610[/code]

James Heinrich 2021-12-21 03:32

[QUOTE=storm5510;595788]I cannot use the bit calculator on [I]mersenne.ca[/I]. It keeps disappearing when I hover over the box.[/QUOTE]It seems to be working as expected for me. If it sits inconveniently on your screen you can also use the version at [URL="https://www.mersenne.ca/sitemap"]mersenne.ca/sitemap[/URL]
Or use the [URL="https://www.mersenne.ca/json2bbcode.php"]BBcode converter[/URL] to give you pretty output like:[quote][M]M697397[/M] has a 102.838-bit (31-digit) factor: [url=https://www.mersenne.ca/M697397]9063851744869270329116505270383[/url] (ECM,B1=250000,B2=23250000)[/quote]

storm5510 2021-12-22 19:25

[QUOTE=James Heinrich;595809]It seems to be working as expected for me. If it sits inconveniently on your screen you can also use the version at [URL="https://www.mersenne.ca/sitemap"]mersenne.ca/sitemap[/URL]
Or use the [URL="https://www.mersenne.ca/json2bbcode.php"]BBcode converter[/URL] to give you pretty output like:[/QUOTE]

It many have different behaviors based on the web browser used. Sometimes, I use Edge and other times Firefox. I know, it does not make any sense to use two. In any case, I believe my previous record was 29 digits, also ECM. I had it in a text file, but cannot find it now. I may have stored it away somewhere.

Many thanks! :smile:

James Heinrich 2021-12-22 19:48

[QUOTE=storm5510;595971]I believe my previous record was 29 digits, also ECM. I had it in a text file, but cannot find it now. I may have stored it away somewhere.[/QUOTE]Your [URL="https://www.mersenne.ca/userfactors/ecm/63934/bits"]previous record[/URL] was in fact [b]3[/b]9 digits.

storm5510 2021-12-23 17:46

[QUOTE=James Heinrich;595973]Your [URL="https://www.mersenne.ca/userfactors/ecm/63934/bits"]previous record[/URL] was in fact [b]3[/b]9 digits.[/QUOTE]

Oh! My bad. :blush:

techn1ciaN 2021-12-25 02:12

M[M]109101319[/M] has a factor: 89994947583983983892401

First find for my old laptop that I just dug out and set to doing P-1. It's fairly low-end (two-core Zen+, 8 GB RAM) and can finish maybe two wavefront P-1 runs a day with [c]tests_saved=1[/c], so hitting pay dirt within two exponents was a pleasant surprise (and a handy confirmation of hardware functionality).

Interestingly, this factor could also have been found with TF77.


All times are UTC. The time now is 06:52.

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