[QUOTE=petrw1;473230]2307677
F-PM1
2017-12-06 02:44
Factor: 305924195866403106191552498276182730434001 / (P-1, B1=6000000, B2=180000000, E=12)[/QUOTE]
k=66284015455023191328672188152021000=2^3 × 5^3 × 7 × 3433 × 15581 × 36269 × 249647 × 507697 × 38510141

42 digits, 138 bits, nice find!

P-1 found a factor in stage #1, B1=670000.
UID: Jwb52z/Clay, M84928609 has a factor: 280163322369309428227183 (P-1, B1=670000)

77.891 bits.

[QUOTE=petrw1;473230]2307677
F-PM1
2017-12-06 02:44
Factor: 305924195866403106191552498276182730434001 / (P-1, B1=6000000, B2=180000000, [COLOR=DarkRed][B]E=12[/B][/COLOR])[/QUOTE]

What is the significance of the item in bold above? I've seen this in some of my PM1 tests, but usually much lower.

[QUOTE=storm5510;473772]What is the significance of the item in bold above? I've seen this in some of my PM1 tests, but usually much lower.[/QUOTE][url=http://www.mersennewiki.org/index.php/Brent-Suyama_extension]Brent-Suyama extension[/url] - It potentially allows finding some types of factors outside the expected B1/B2 bounds for P-1, but requires generous amounts of RAM. Values can be up to 12 if lots of RAM available, 6 if less RAM available (and I think sometimes it could be 3(?) but don't quote me on that).
To get E=12 on current ~80M range exponents you'll need something in the order of ~10GB allocated to P-1.

ECM found a factor in curve #3, stage #2

Sigma=6233548487723791, B1=50000, B2=5000000.

UID: nitro/haswell, M2004917 has a factor: 308301002035645140354241

**

78.03 bits

150 bits
 

ECM found a factor in curve #1, stage #2
Sigma=3200091177920085, B1=50000, B2=5000000.
UID: nitro/haswell, M2122937 has a factor: 1498439627815726005558688529761315320138259649 (ECM curve 1, B1=50000, B2=5000000), AID: EDB1D4AB43C885B359204C31FB202EAA


...a quick check at mersenne.ca shows this is actually a composite factor...

P-1 found a factor in stage #1, B1=675000.
UID: Jwb52z/Clay, M85393921 has a factor: 14072321778883706915013177017 (P-1, B1=675000)

93.507 bits

P-1 found a factor in stage #2, B1=675000, B2=12487500.
UID: Jwb52z/Clay, M85629839 has a factor: 816642824855310862859977 (P-1, B1=675000, B2=12487500),

79.434 bits.

P-1 found a factor in stage #1, B1=675000.
UID: Jwb52z/Clay, M85654649 has a factor: 402442961353006714077071 (P-1, B1=675000)

78.413 bits

P-1 found a factor in stage #2, B1=675000, B2=12487500.
UID: Jwb52z/Clay, M85758499 has a factor: 200074641364733559033419273 (P-1, B1=675000, B2=12487500)

87.371 bits.

This one is smooth! [URL="http://www.mersenne.org/report_exponent/?exp_lo=24639113&full=1"]M24639113[/URL] has a factor: [URL="http://www.mersenne.ca/factor/1542983967870622198424294628794130841"]1542983967870622198424294628794130841[/URL].
P-1, B1 = 500,000, B2 = 30,000,000, E = 12.
37 digits, 120.215 bits.
[$$]k=2^2 \cdot 3 \cdot 5 \cdot 29 \cdot 61 \cdot 313 \cdot 509 \cdot 5879 \cdot 8221 \cdot 9133 \cdot 4194919[/$$]