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-   -   fond of a factor? Urn yourself to become remains (https://www.mersenneforum.org/showthread.php?t=13977)

markr 2012-07-12 10:47

I haven't done any low P-1 for a while, but couldn't resist. Very pleased to find a factor fairly quickly, although it means there will now be a long drought :grin:.
P-1 found a factor in stage #2, B1=6000000, B2=240000000.
M838909 has a factor: 1453468273441466194761003847
28 decimal digits, 91 bits
k = 3^2 x 181 x 23117 x 130469 x 176319691

TObject 2012-07-12 18:05

M67389481 has a factor: 1543348085740945176727
k = 3^3 * 11 * 82757 * 465887 = 11450956906323

TObject 2012-07-12 18:25

M344112403 has a factor: 1042173856480468315151
k = 5^2 * 31 * 103 * 18970157 = 1514292782525

Jwb52z 2012-07-13 04:36

M56309941:

P-1 found a factor in stage #1, B1=545000.
UID: Jwb52z/Clay, M56309941 has a factor: 21878160101311995365897

It is 74.212 bits which is another one that was narrowly missed by previous work, I guess.

Jwb52z 2012-07-13 13:59

This is just my lucky day

M56570351

P-1 found a factor in stage #1, B1=560000.
UID: Jwb52z/Clay, M56570351 has a factor: 189058627460533229809313

It's 77.323 bits, so it's another factor that isn't hugely far beyond the previous factoring work.

Bdot 2012-07-13 14:42

[QUOTE=Axelsson;304496]Done!

I've re-run all the candidates I tested with mfakto 0.11 earlier and with the new 0.12 code I found 19 factors, two already known.

I even think the new program is a bit faster than the old one.

:smile: :tu:

/Göran[/QUOTE]

Oh, and BTW, my mfaktc-run returned the same set of factors. This means all candidates for mfakto-missed factors have been rechecked. Thanks again to all involved in the cleanup.

c10ck3r 2012-07-14 03:00

M890091977 has a factor: 1966225272665366346285896554164056540033-130.531 bits
splits as:
M890091977 has a factor: 47183073503648976793-65.359 bits
M890091977 has a factor: 41672259279873008681-65.176 bits
k=2^2*3^2*17*467*92737
k=2^2*5*31*37*79*12917
Could've been found with ~B1=13k B2=95k or b1=b2=93k

TObject 2012-07-16 17:27

M344112799 has a factor q=321855887896651410431; log2(q)=68.125...
k = 5 * 19 * 29 * 31 * 5475797 = 467660442785; log2(k)=38.767...

Jwb52z 2012-07-16 19:41

P-1 found a factor in stage #1, B1=560000.
UID: Jwb52z/Clay, M56726627 has a factor: 67204881864680452191371071

It's 85.797 bytes.

Jwb52z 2012-07-18 13:41

P-1 found a factor in stage #2, B1=565000, B2=11158750.
UID: Jwb52z/Clay, M56907583 has a factor: 7878087690390529790977

This was narrowly missed by TF because the factor is only: 72.738 bits

Jwb52z 2012-07-18 19:16

P-1 found a factor in stage #2, B1=565000, B2=11158750.
UID: Jwb52z/Clay, M56929319 has a factor: 26321049935496807610001

74.479 bits.


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