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-   -   Mersenne number factored (disbelievers are biting elbows) (https://www.mersenneforum.org/showthread.php?t=19407)

GP2 2020-10-01 18:13

The 348th fully-factored or probably-fully-factored Mersenne number with prime exponent (not including the Mersenne primes themselves) is [M]M4349[/M].

The most recent factor (41 digits) was found by Ryan Propper on September 30 and the PRP test was done by mnd9.

[URL="http://factordb.com/index.php?id=1100000001579350367"]FactorDB link[/URL].

GP2 2020-10-07 01:00

[QUOTE=GP2;558515][URL="http://factordb.com/index.php?id=1100000001579350367"]FactorDB link[/URL].[/QUOTE]

As of this writing, this hasn't got a certification. FactorDB did not assign one automatically, the exponent must be too big.

Edit: now it's certified.

GP2 2020-12-17 01:23

The 349th fully-factored or probably-fully-factored Mersenne number with prime exponent (not including the Mersenne primes themselves) is [M]M1489[/M].

The most recent factor (60 digits) was found by nordi on December 17 (UTC) and the PRP test was also done by nordi. There are 7 factors in all, plus the cofactor.

[URL="http://factordb.com/index.php?id=1100000002332264431"]FactorDB link[/URL].

LaurV 2020-12-17 06:33

[QUOTE=GP2;566411]or probably-fully-factored[/QUOTE]
Do you mean we don't know if the ~235 digits cofactor is definitively prime or not? :razz:


Congrats for the very nice ECM hit! :party:

axn 2020-12-17 09:06

[QUOTE=LaurV;566424]Do you mean we don't know if the ~235 digits cofactor is definitively prime or not? :razz:[/QUOTE]

Please re-read posts 508-511 :judge: :whack:

LaurV 2020-12-17 09:12

[QUOTE=axn;566431]Please re-read posts 508-511 :judge: :whack:[/QUOTE]
Yes Sir! :blush:
(now, I am worrying... I am fxcking getting older and stupider! I could not remember that discussion, before re-reading it!)

Edit: hey Mike/Serge! (only you can touch posts without letting fingerprints). I remember for sure that my "size approximations" (mental calculation) was like "~300 digits" which I wrote there, and for sure I didn't make it so accurate, haha. If I would have done it so accurate, by either computing the cofactor or looking for it, then the "~" sign ("about") would have had no sense. The cofactor is indeed 235 digits (just checked FDB). So, one of you decided to fix my approximation, or I am getting nuts for real?

axn 2020-12-17 09:21

[QUOTE=LaurV;566432]I am fxcking getting older and stupider! [/QUOTE]

No doubt :missingteeth: :razz:

Dr Sardonicus 2020-12-17 12:46

[QUOTE=LaurV;566432](now, I am worrying... I am fxcking getting older and stupider! I could not remember that discussion, before re-reading it!)[/QUOTE]There is a Pennsylvania Dutch proverb, "We grow too soon old, and too late smart."

As to getting older, you simply have to live with it. You can [i]not[/i] live with the alternative.

As to "stupider," that's not the right adjective. "More forgetful," particularly of things in the near past, almost certainly.

:paul:
Back in the days of the Usenet, when I suddenly realized I simply wasn't remembering things in the way I had long taken for granted, I posted to the effect that "The thing I forget that gets me in the most trouble is, I keep forgetting that my memory isn't as good as it used to be."[sup]†[/sup] I got a very gratifying response: "It's not nice to make people spray coffee all over their monitors."

If only I remembered recent things that well...

[sup]†[/sup]For the edification of younger denizens of the Forum, who have yet to experience what I'm talking about, what I meant by this was that, I often still counted on my memory being as good as it had been, even though it wasn't, and that I consequently failed to do things because I had forgotten them, whereas previously I would have remembered. I had to learn to compensate for this distressing change in circumstances. In the context of online discussions, it meant that it was a good idea to scan earlier posts on a given topic before :deadhorse:

Nowadays, it is almost second nature to make out a shopping list before heading out on a shopping trip. This really helps, except for when (a) I get to my first stop, and realize I left the list at home, or (b) I bring the list, but forget to consult it.

retina 2020-12-17 12:54

[QUOTE=Dr Sardonicus;566442]Nowadays, it is almost second nature to make out a shopping list before heading out on a shopping trip. This really helps, except for when (a) I get to my first stop, and realize I left the list at home, or (b) I bring the list, but forget to consult it.[/QUOTE]... or (c) you forgot where the shops are and where your house is and spend the rest of your life sleeping on the park bench wondering who you are. :davar55:

Dr Sardonicus 2020-12-17 14:50

[QUOTE=retina;566443]... or (c) you forgot where the shops are and where your house is and spend the rest of your life sleeping on the park bench wondering who you are. :davar55:[/QUOTE]Speak for yourself.

It occurs to me that this would be a [i]great[/i] way to put off inquiries as to the location of your evil lair: "I've forgotten!"

Uncwilly 2020-12-17 15:04

[QUOTE=Dr Sardonicus;566449]It occurs to me that this would be a [i]great[/i] way to put off inquiries as to the location of your evil lair: "I've forgotten!"[/QUOTE]I know where it is (at least within a 840km radius circle.)


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