is 2 2870587 - 1
has 864133 decimal digits
takes 0.222 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LF32F6F64401ED076double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26820.764067.6471 %50000002000000001.74989.1794 %22.513870.6169 %
Target2630.556065.0794 %1600014000000.01021.8696 %0.566265.7322 %
Difference+5+20.2080+2.5677 %+4984000+198600000+1.7395+7.3098%+21.9476+4.8846 %

Known prime factors (1 factor, 69.3 bits, 0.00241317% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
28705877128751343002187339832169.272124168878055293
3 × 31 × 79 × 16900623119
2020-08-30791690062311941.590103.12192.60

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-11-28ANONYMOUSv4_computers2048204800--0.0010.686%
2009-07-03Carsten Kossendeymother15000157500--0.0031.552%
2010-12-22JossManual testing2000020000--0.0020.641%
2011-01-03JossManual testing3000030000--0.0040.846%
2011-01-21JossManual testing5000050000--0.0061.159%
2011-02-05markrtiny11500025300006--0.0304.705%
2016-09-14JossManual testing15306527830006--0.0374.985%
2016-09-21JossManual testing1530653061300--0.0385.085%
2016-12-18JossManual testing183678183678---2.244%
2017-01-10JossManual testing220413220413---2.429%
2017-03-11JossManual testing31739431739406--0.0585.539%
2017-12-27JossManual testing63478863478806--0.1176.767%
2019-10-26masserManual testing28800002880000012--0.5309.704%
2020-02-27masserManual testing500000020000000012--1.92813.187%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2016-02-23Mark RoseManual testing212600.054
2009-02-14Sturle Sundeletov.ifi2602610.054
2012-01-24Grant McCrackenthumper2612620.107
2013-01-10dbaughManual testing2622630.342
2015-04-21VictordeHollanderManual testing2632640.684
2015-04-21VictordeHollanderManual testing2642651.302
2016-02-18ramgeisManual testing2652662.603
2017-11-12Gordon SpenceManual testing2662675.206
2019-01-09chuenkitManual testing26726810.41


ECM factoring results:
Total ECM effort:2.890 GHz-days
Estimated T-Level:20.498
DigitsB1CompleteFacMiss
20110001.07734.064%
25500000.10090.516%
302500000.00699.373%


ECM Summary

B1B2factorcurvesGHz-days
500005000000242.471
50000500000040.418


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-23ANONYMOUSv4_computersF32F6F64401ED0760.222
2018-09-21kkmrkkblmbrbkoldF32F6F64401ED0760.222


PRP results:
dateuseridcompidcofactorsres64
2020-08-30M Millercruncher
712875134300218733983
488CC9B80B262377


CERT results:
dateuseridcompid
2020-08-30Ben Deloi-0205ccffc43be50bc


P-1 factor-bounds graph:
B1 = 5000000, B2 = 200000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 2880000, B2 = 28800000 (P-1 stage 2)
B1 = 2880000 (P-1 stage 1)
B1 = 634788, B2 = 6347880 (P-1 stage 2)
B1 = 634788 (P-1 stage 1)
B1 = 317394, B2 = 3173940 (P-1 stage 2)
B1 = 317394 (P-1 stage 1)
B1 = 153065, B2 = 3061300 (P-1 stage 2)
B1 = 153065, B2 = 2783000 (P-1 stage 2)
B1 = 115000, B2 = 2530000 (P-1 stage 2)
B1 = 220413 (P-1 stage 1)
B1 = 183678 (P-1 stage 1)
B1 = 153065 (P-1 stage 1)
B1 = 115000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 157500 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=20.5 ~= 51-bit
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260
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Last modified: 2024-02-29T14:28:04+00:00