Found a factor? Post it here. Or forever fold your crease.

[YuL]

[Sat Feb 07 11:04:31 2015]
P-1 found a factor in stage #1, B1=825000.
UID: ****, M73012001 has a factor: 20078579801333391977956082839 (P-1, B1=825000)

94.02 bits
k = 3×73×139×389×683×35267×482071

[VictordeHolland]

[Tue Feb 10 23:22:51 2015]
P-1 found a factor in stage #2, B1=10000000, B2=200000000, E=12.
UID: VictordeHollander/PCVICTOR, M1609063 has a factor: 688971262380939975396559401247 (P-1, B1=10000000, B2=200000000, E=12)

30 digits, 99.12 bits
k = 214090828755909487508121 = 3 × 19 × 223 × 6,343 × 4,351,547 × 610,210,891
Another B-S!

[alpertron]

Originally Posted by LaurV

That's extremely easy ECM hit, 47326098603400241-9 factors as 2^3*7^2*11*29*101*1259*1289*2309

It is easy only if your computer selects one of the lucky values of sigma for which the group order is the number you mentioned.

[YuL]

[Thu Feb 12 16:22:15 2015]
P-1 found a factor in stage #2, B1=825000, B2=24000000, E=6.
UID: ****, M73012031 has a factor: 43976881458608153910283872823715921 (P-1, B1=825000, B2=24000000, E=6)

115.082 bits
k=2^3 × 5 × 13 × 173 × 1777 × 246689 × 464549 × 16439243

[lycorn]

Look at this beauty:

ECM found a factor in curve #1168, stage #2
Sigma=6873794231931630, B1=11000000, B2=1100000000.
UID: lycorn/asteroid, M20011 has a factor: 187852747203883018784775678996501624848413313 (ECM curve 1168, B1=11000000, B2=1100000000),


147.074 bits

K = 2⁶ × 541 × 3547 × 489113 × 39334897501 × 1986520754106589

I threw all 4 cores of an i5-750 at it, running a total of ~5000 curves.

[bloodIce]

Originally Posted by lycorn

Look at this beauty:

ECM found a factor in curve #1168, stage #2
Sigma=6873794231931630, B1=11000000, B2=1100000000.
UID: lycorn/asteroid, M20011 has a factor: 187852747203883018784775678996501624848413313 (ECM curve 1168, B1=11000000, B2=1100000000),


147.074 bits

K = 2⁶ × 541 × 3547 × 489113 × 39334897501 × 1986520754106589

I threw all 4 cores of an i5-750 at it, running a total of ~5000 curves.

Super nice find! Untouchable by Pm1. I wish more people are throwing all 4 in these "small" exponents. Keep the factors coming.

[lycorn]

Originally Posted by bloodIce

Keep the factors coming.

Well, finding factors this large is hard. It takes a lot of curves to get one.
I´m currently putting M11423 through the same process. There are still 4000 curves to run @B1=11000000. If nothing comes up. I´ll move to B1=44000000. But that yes, will be really tough...

[petrw1]

Any I find will be reported to PrimeNet (Prime95); is there any reason they can't be found there and need to be reported here specifically?

[Prime95]

Originally Posted by petrw1

Any I find will be reported to PrimeNet (Prime95); is there any reason they can't be found there and need to be reported here specifically?

No, this thread is solely for "bragging" about a found factor. One can brag for any number of reasons, very large factors, factors with unusual P-1 factorizations, factors barely above the TF level, etc.

[Dubslow]

Once, back even before I was a semimod, this thread had a vaguely descriptive title.

[Prime95]

Originally Posted by Dubslow

Once, back even before I was a semimod, this thread had a vaguely descriptive title.

The title hasn't changed in over a year, time to begin another round of changes....