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-   -   Found a factor? Post it here. (https://www.mersenneforum.org/showthread.php?t=13977)

 nordi 2022-05-05 18:07

When looking at this result, I was expecting it to be yet another composite factor. Turns out it wasn't:

[M]M12731681[/M] has a 151.792-bit (46-digit) factor: [URL="https://www.mersenne.ca/M12731681"]4942614515973735792916302243662188576877302039[/URL] (P-1,B1=400000,B2=428459850)

That will be 17th place on the [URL="https://www.mersenne.ca/userfactors/pm1/1/bits"]Mersenne top factors for P-1[/URL] and is by far the biggest factor I ever found with P-1! :big grin:

 LaurV 2022-05-06 02:29

Whaaa! Congrats! Nice found!
Same number of digits like my best (currently position 13), but it falls about 0.9 bits shorter :razz:

 nordi 2022-05-10 19:23

Getting lucky again with my P-1 factoring:

[M]M12782851[/M] has a 235.159-bit (71-digit) [B]composite[/B] (P21+P24+P27) factor: [URL="https://www.mersenne.ca/M12782851"]61645213700098762638579831947213762951673986053039553206940532463429217[/URL] (P-1,B1=400000,B2=428459850)

That's the biggest triple factor I ever found (out of 4 in total).

 Jwb52z 2022-05-11 16:02

P-1 found a factor in stage #1, B1=509000.
UID: Jwb52z/Clay, M115285087 has a factor: 111450819426998736215606681 (P-1, B1=509000)

86.527 bits.

 DrobinsonPE 2022-05-16 02:37

I finally found one that made the top 500 in this list [url]https://www.mersenne.ca/userfactors/pm1/1/bits[/url].

[url]https://www.mersenne.ca/exponent/3884411[/url] has a 123.607 bit exponent.

currently at #384 and the first factor I have found larger than 109 bits!

 James Heinrich 2022-05-16 02:52

[QUOTE=DrobinsonPE;605923]...the first factor I have found larger than 109 bits![/QUOTE]But according to your [url=https://www.mersenne.ca/userfactors/pm1/82293/bits]personal factors list[/url], you've found this and 4 other factors larger than 109.x bits, including two larger than this (131 & 136 bits, #84 & #158 in the top-500 list).

 DrobinsonPE 2022-05-16 03:38

[QUOTE=James Heinrich;605924]But according to your [url=https://www.mersenne.ca/userfactors/pm1/82293/bits]personal factors list[/url], you've found this and 4 other factors larger than 109.x bits, including two larger than this (131 & 136 bits, #84 & #158 in the top-500 list).[/QUOTE]

Cool! I did not know that list existed. I was just watching the factors I found and keeping track in my head. Obviously i missed a few and found some before I started looking.

You are my new favorite person for today!

 LordJulius 2022-05-17 00:27

[QUOTE=James Heinrich;605924]But according to your [URL="https://www.mersenne.ca/userfactors/pm1/82293/bits"]personal factors list[/URL], ...[/QUOTE]

Hi James. Are you the right person to ask about merging my two IDs as shown on that list (the old "Lord Julius" into newer "LordJulius")? If it's simple, I would appreciate it.

 James Heinrich 2022-05-17 01:27

[QUOTE=LordJulius;605965]Hi James. Are you the right person to ask about merging my two IDs as shown on that list (the old "Lord Julius" into newer "LordJulius")? If it's simple, I would appreciate it.[/QUOTE]I am the right person to ask about anything on mersenne.ca :smile:
I have renamed/merged all [c]Lord Julius[/c] into [c]LordJulius[/c].

 Jwb52z 2022-05-17 21:16

P-1 found a factor in stage #1, B1=510000.
UID: Jwb52z/Clay, M115435169 has a factor: 12873265828509838756458407 (P-1, B1=510000)

83.413 bits.

 mrh 2022-05-22 15:31

[M]M110368889[/M] has a 119.453-bit (36-digit) factor: [url=https://www.mersenne.ca/M110368889]909751501112745686529881562093681577[/url] (P-1,B1=585000,B2=34699170)

one of my older machines still working hard...

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