[QUOTE=flashjh;360255]But, it's nothing compared to markr's Brent-Suyama find on 18 Nov 13:

575,00010,350,000
[URL="http://www.mersenne.ca/exponent/64369951"]M64369951[/URL]
B1: 575,000
B2: 10,350,000
k = 2 × 15442959807541[COLOR="Red"][B]2[/B][/COLOR][/QUOTE]

Even more sensational: we've found a [B]second even prime number[/B]! (SCNR)

Oliver

[QUOTE=TheJudger;360366]Even more sensational: we've found a [B]second even prime number[/B]! (SCNR)

Oliver[/QUOTE]
[URL="http://mersenneforum.org/showthread.php?p=359853#post359853"]:rolleyes:[/URL] (I definitely missed that)

[CODE]
k = 308859196150824 = 2[SUP]3[/SUP] × 3 × 11 × 17 × 63607 × 1081939
[/CODE]Now that changes everything.

[QUOTE=flashjh;360336]You are on a roll. What memory settings do you use on those systems?[/QUOTE]Most are around 1.5GB. All have MaxHighMemWorkers=1 with 2 cores set to do P-1. (5 machines, 10 cores total devoted to P-1.)

P-1 found a factor in stage #1, B1=615000.
UID: Jwb52z/Clay, M68988589 has a factor: 1942414686951074496166120411317991

110.581 bits.

This is the second largest factor I've ever found in all the years I've tried to help with the GIMPS project and for this range, it seems like a large factor to find that is not composite.

It is large! Nice find!

P-1 found a factor in stage #1, B1=750000.
UID: Jwb52z/Clay, M69263003 has a factor: 32482532468448662230681

74.782 bits.

This one was begging to be found by TF, but...

[I]ECM found a factor in curve #3, stage #2
Sigma=5161819488172506, B1=50000, B2=5000000.
UID: lycorn/asteroid, M721291 has a factor: 2993117629186363967
[/I]
61.376 bits.

There are still some low hanging fruits in the < 1M range.

P-1 found a factor in stage #2, B1=615000, B2=11070000.
UID: Jwb52z/Clay, M68952557 has a factor: 10830722799622637276915875201

93.129 bits.

Hey Kracker, that computer of yours is a lucky son of the gun! Aren't you thinking to sell it? :razz:

[CODE]gp> a=7912085265544058288516871389169907393;
gp > #binary(a)
%1 = [COLOR=Red][B]123[/B][/COLOR]
gp > factorint(a-1)
%2 =
[2 6]
[3 1]
[31 1]
[47 1]
[1657 1]
[6221 1]
[116791 1]
[301237 1]
[1206169 1]
[64657903 1]
gp >
[/CODE](I didn't want to pollute the other thread - and upset Batalov even more :P - as the discussion there already changed to a more thematic and theoretic path)

:ouch2:

Speaking of the <1M range:

Eleven ECM curves at B1=50000,B2=5000000 found three factors of M298691:
110218037145723511, 586220733693722359 and 137619491689490903327
(to go with the smaller three factors previously known).