[QUOTE=Gary;437203]I will take the following ranges. If you hear from any of the researchers that originally reserved these ranges that they are still working on it, then let me know and I will strike them from my list.

[FONT=Courier New][COLOR="Red"][SIZE=2] 500 [/SIZE][SIZE=2]599 [/SIZE][SIZE=2]40,000,000,000 [/SIZE][SIZE=2]100,000,000,000[/SIZE][/COLOR]
[SIZE=2] 301 [/SIZE][SIZE=2]500 [/SIZE][SIZE=2]10,000,000,000 [/SIZE][SIZE=2]15,000,000,000[/SIZE]
[SIZE=2] 501 [/SIZE][SIZE=2]1000 [/SIZE][SIZE=2]2,000,000,000 [/SIZE][SIZE=2]3,000,000,000[/SIZE]
[SIZE=2] 2001 [/SIZE][SIZE=2]3000 [/SIZE][SIZE=2]400,000,000 [/SIZE][SIZE=2]500,000,000[/SIZE]
[SIZE=2] 450 [/SIZE][SIZE=2]499 [/SIZE][SIZE=2]400,000,000,000 2[/SIZE][SIZE=2],000,000,000,000 Lowered Kmax[/SIZE]
[SIZE=2]20000 [/SIZE][SIZE=2]25000 [/SIZE][SIZE=2]1,000,000 [/SIZE][SIZE=2]2,000,000[/SIZE]
[COLOR="Red"][SIZE=2] 420 [/SIZE][SIZE=2]429 [/SIZE][SIZE=2]1,000,000,000,000 [/SIZE][SIZE=2]1,050,000,000,000[/SIZE][/COLOR]
[COLOR="Red"][SIZE=2] 300 [/SIZE][SIZE=2]309 [/SIZE][SIZE=2]2,200,000,000,000 [/SIZE][SIZE=2]2,250,000,000,000[/SIZE][/COLOR]
[COLOR="Red"][SIZE=2] 420 [/SIZE][SIZE=2]429 [/SIZE][SIZE=2]2,200,000,000,000 [/SIZE][SIZE=2]2,400,000,000,000 4 old ranges[/SIZE][/COLOR]
[SIZE=2] 500 [/SIZE][SIZE=2]509 [/SIZE][SIZE=2]800,000,000,000 [/SIZE][SIZE=2]850,000,000,000[/SIZE]
[SIZE=2] 2300 [/SIZE][SIZE=2]2399 [/SIZE][SIZE=2]1,500,000,000 [/SIZE][SIZE=2]1,600,000,000[/SIZE]
[SIZE=2] 500 [/SIZE][SIZE=2]539 [/SIZE][SIZE=2]150,000,000,000 [/SIZE][SIZE=2]200,000,000,000[/SIZE]
[/FONT]
Also, what is the status of the following range, owned by Franz Fritz and last updated 2014/09/22?

[FONT=Courier New][SIZE=2] 500 [/SIZE][SIZE=2]599 [/SIZE][SIZE=2]400,000,000,000 [/SIZE][SIZE=2]800,000,000,000[/SIZE]
[/FONT]
Thanks![/QUOTE]

Franz Fritz confirmed his range
[code]
500 599 400,000,000,000 800,000,000,000
[/code]

Yesterday Roman Maznichenko sent me an email saying he had previously worked on the older ranges in view of a possible release. He worked on the following ranges:

[code]
Nmin Nmax Kmin Kmax Status
300 309 22x10^11 22.5x10^11 Complete (previously assigned to Samuel Xiong)
320 329 30x10^11 30x10^12 Reserved (40%)
420 429 10x10^11 10.5x10^11 Complete (previouslyassigned to Bryan Kalashnikov)
420 429 22x10^11 22.5x10^11 Complete (previously assigned to Gary Baxter)
420 429 22.5x10^11 23x10^11 Complete (previously assigned to Michael Dangler)
420 429 23x10^11 23.5x10^11 Complete (previously assigned to Michael Dangler)
420 429 23.5x10^11 24x10^11 Complete (previously assigned to Michael Dangler)
500 599 4x10^10 10x10^10 Reserved (71%) (previously assigned to Sergei Maiorov)
[/code]

So, apart from the red lines, you are welcome to proceed (even the lowered k range is ok for me).

Just let me know if you will use your software, or search for gfn as well with the higher Ns.

Thank you for your help!

Luigi

Now that Fermat Search has a new subforum in FermatSearch, I ask supermods to move this thread :smile:

At the risk of showing my ignorance ... are these new????
 

From the latest Recent Results page:

[CODE]zmerl Elettro 4096 F-ECM 2016-08-25 14:19 0.3 0.8295 239009526063309834309009409
David Bessell G805 4096 F-ECM 2016-08-25 13:52 3.6 0.8295 239012339910309306759513718485221377[/CODE]

It seems odd that they both start with 2390.

I don't see them in this page:
[url]http://www.fermatsearch.org/factors/composite.php[/url]

Probably not....they seem to be found regularly....

239009526063309834309009409 = 190274191361 * 1256132134125569
239012339910309306759513718485221377 = 114689 * 26017793 * 63766529 * 1256132134125569

It's just a coincidence that they both start with the same four digits.

Edit:
If you have python, you can check easily:

[CODE]factors=(114689,26017793,63766529,190274191361,1256132134125569,568630647535356955169033410940867804839360742060818433)
n=239009526063309834309009409

# Is n a factor of F12?
pow(2,4096,n) == n - 1
# True

# If n is a factor of F12, is it a new prime factor?
all(n%f for f in factors)
# False[/CODE]

[QUOTE=GP2;440659]239009526063309834309009409 = 190274191361 * 1256132134125569
239012339910309306759513718485221377 = 114689 * 26017793 * 63766529 * 1256132134125569

It's just a coincidence that they both start with the same four digits.

[/QUOTE]

Crap....I even tried to see if it was a product of existing factors...apparently I didn't do very well at that attempt. Thx

I just received an email from Gary Gostin:

[code]
I would like to report the following new Fermat factor:



58951871175 * 2 ^ 1299 + 1 divides F1296



This was discovered using my GMP-based pmfs program running on an HPE Superdome X system.
[/code]

Congratulation Gary! :smile:

[QUOTE=ET_;446165]I just received an email from Gary Gostin:

[code]
I would like to report the following new Fermat factor:



58951871175 * 2 ^ 1299 + 1 divides F1296



This was discovered using my GMP-based pmfs program running on an HPE Superdome X system.
[/code]

Congratulation Gary! :smile:[/QUOTE]

What is "pmfs"? Is it available for others to use? Is it open source? How does it compare go gmp-fermat?

[QUOTE=rogue;446180]What is "pmfs"? Is it available for others to use? Is it open source? How does it compare go gmp-fermat?[/QUOTE]

At the momet, pmfs is not open source: it has been developed by Gary Gostin. I will ask him to make some benchmarks soon.

Roman Maaznichenko found a new one!
 

Here is his message:

-------
Mon Nov 28 23:21:31 2016
Found factor 8662575142599*2^289+1

HW: GTX580 (factoring) + 1 core Intel (Skylake) i5-6600K@4000GHz (sieve)
SW: my own program Feromant_CUDA (compiled under Win64 with CUDA 7.0)

I verified him by Feromant (for CPU):
Tue Nov 29 22:32:57 2016
Found factor 8662575142599*2^289+1 of 2^(2^287)+1

It is worth noting that this is the third divider F287.
---------------------

The site will be updated as soon as possible :smile:

Cogratulations Roman!

New factor from Gary Gostin!
 

December 5th, 2016
New Fermat factor from FermatSearch!
26778342591 * 2[sup]1683[/sup]+1 is a Factor of F[sub]1680[/sub]!!!
Gary Gostin found this new Fermat factor using his GMP-based pmfs program running on an HPE Superdome X system
with 240 Ivy Bridge cores (E7-8890 v2 @ 2.80 GHz).
Congratulations to Gary from FermatSearch, for his fourth factor of the year, the sixth factor this year!

New Fermat factor from FermatSearch
 

I would like to report a new Fermat factor:

[FONT=Calibri][SIZE=3]9,659,599,821 * 2^2125 + 1 divides F2123[/SIZE][/FONT]

This was discovered on Dec 16 running pmfs on an HPE Superdome X system. I sent Luigi new range reservations from N = 2000 to 3999 a few weeks ago.

Happy Holidays!

Gary