20211124, 15:49  #1981 
Jan 2021
California
3·101 Posts 
My first P1 factor:
UID: slandrum/BB2, M115047523 has a factor: 26766179697464143575646837913 (P1, B1=846000, B2=25442000, E=6) 94.4 bits Last fiddled with by slandrum on 20211124 at 16:02 Reason: Change UID name to public name 
20211124, 15:55  #1982 
"James Heinrich"
May 2004
exNorthern Ontario
111000001110_{2} Posts 

20211124, 17:53  #1984  
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
2×3^{2}×277 Posts 
Quote:
Over 56,000 attempts I average a factor every 30 or 40 but have seen stretches as high as 373 with no factor....and every time I have a bad stretch I still want to suspect the hardware....then they snap out of it and make up for lost time. Patience is a virtue. 

20211125, 22:14  #1986 
Bemusing Prompter
"Danny"
Dec 2002
California
11·13·17 Posts 

20211202, 08:13  #1987 
Aug 2020
79*6581e4;3*2539e3
743_{8} Posts 
My first P+1 factor and even a relatively large one and a relatively smooth one and of a relatively small Mersenne number:
Code:
M211231 Start=2/7, B1=150,000,000, Factor: 44020293565604983870643000656007 (32 digits, 105.1 bits) P+1 = 2^3 * 3 * 17^2 * 83 * 157 * 2441 * 258337 * 17578577 * 43936757 
20211204, 03:40  #1988 
Oct 2021
U.S. / Maine
132_{10} Posts 
M997577587 has a factor: 11562860692189321253647
M997571873 has a factor: 18373625784649599011423 M997570663 has a factor: 14100309041276501026441 M997564333 has a factor: 13823818175199038095129 M997561469 has a factor: 17272242508747031148527 M997557647 has a factor: 18246811250485963666177 M997557367 has a factor: 13755089029976709478417 M997555331 has a factor: 13188178428948819158353 I usually TF at the DC wavefront, but I've been having a dry streak of more than 300 exponents there. I loaded about 600 of these 997,xxx,xxx exponents as a hardware sanity check since they run so quickly at current TF levels. Conclusion: lack of DC luck is indeed just that, bad luck. Interestingly, my throughput in GHzdays / day is substantially better with DCrange exponents (60–65 M) than with these huge 997 M ones — appx. 970 versus appx. 850. I optimized my MFaktC config by trial and error with a DCrange test exponent, so I thought this might be an artifact of that, but I tried various tweaks and none produced an improvement. Last fiddled with by techn1ciaN on 20211204 at 03:41 Reason: A word 
20211204, 05:54  #1989 
Aug 2020
79*6581e4;3*2539e3
3×7×23 Posts 
Another one, 37 digits, the largest one found by P+1 so far, though admittedly it was found at the P1 part (it's not P+1 smooth at all).
Code:
M214069 Start=2 / 7, B1=150000000, B2=12750000000, Factor: 1765947009958424280438725602396032049 (37 digits, 120.4 bits) P+1 = 2 * 5^2 * 101 * 31723 * 2573471 * 4283440708731964743577 k = 2^3 × 3^2 × 7^2 × 29 × 31 × 757 × 68687 × 3287507 × 7607965061 Last fiddled with by Dr Sardonicus on 20211204 at 16:55 Reason: fignix posty 
20211211, 00:47  #1990 
"Lisander Viaene"
Oct 2020
Belgium
89 Posts 
Feels like I've saved a lamb from the slaughter on this one:
107415289 (factor=67834286362972615909729897, 85.871 bits), it was expired as a PRP test and assigned (very close to cat 0, but still cat 1) to me as P1, I prioritized it and ran it with tests_saved=1 as to make it less likely to hold up a milestone down the line! Also, TF came up with a factor today: 108617059 (factor=144166210879913180106767, 76.932 bits) 
20211211, 02:12  #1991 
Sep 2002
1453_{8} Posts 
P1 found a factor in stage #2, B1=794000, B2=21764000.
UID: Jwb52z/Clay, M108035089 has a factor: 130233006903988384213171714266285847938196943239024729226893649081 (P1, B1=794000, B2=21764000) I know it's a composite factor. Unbroken it's a whopping 216.306 bits. It can be broken down into these two factors: 6384544128130228761451969, which is 82.401 bits and 20398168497290705231363540518336781235449, which is 133.906 bits. Last fiddled with by Jwb52z on 20211211 at 02:16 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Congruent prime numbers that preserves the modulo as the largest prime factor of the sum  Hugo1177  Miscellaneous Math  5  20210211 07:40 
Factorization factory  Branger  Factoring  15  20190905 15:03 
A fond farewell  rogue  Lounge  10  20081121 05:25 
Berry paradox without paradox.  victor  Puzzles  7  20080408 22:34 