Mersenne number factored (disbelievers are biting elbows)

[GP2]

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

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

FactorDB link.

[GP2]

Originally Posted by GP2

FactorDB link.

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]

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

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.

FactorDB link.

[LaurV]

Originally Posted by GP2

or probably-fully-factored

Do you mean we don't know if the ~235 digits cofactor is definitively prime or not?


Congrats for the very nice ECM hit!

[axn]

Originally Posted by LaurV

Do you mean we don't know if the ~235 digits cofactor is definitively prime or not?

Please re-read posts 508-511

[LaurV]

Originally Posted by axn

Please re-read posts 508-511

Yes Sir!
(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]

Originally Posted by LaurV

I am fxcking getting older and stupider!

No doubt

[Dr Sardonicus]

Originally Posted by LaurV

(now, I am worrying... I am fxcking getting older and stupider! I could not remember that discussion, before re-reading it!)

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 not live with the alternative.

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


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."^† 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...

^†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

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]

Originally Posted by Dr Sardonicus

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.

... 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.

[Dr Sardonicus]

Originally Posted by retina

... 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.

Speak for yourself.

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

[Uncwilly]

Originally Posted by Dr Sardonicus

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

I know where it is (at least within a 840km radius circle.)