is 2 2876483 - 1
has 865908 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-LFA0D0BB811299E4Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26820.721467.6471 %50000002000000001.74989.1812 %22.471270.6174 %
Target2630.554865.0794 %1600014000000.01021.8703 %0.565165.7325 %
Difference+5+20.1666+2.5677 %+4984000+198600000+1.7395+7.3108%+21.9061+4.8849 %

Known prime factors (1 factor, 80.0 bits, 0.00278285% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
287648312500686336085836383743112580.048217291156180756785
32 × 5 × 17 × 284040727033669
2020-12-091728404072703366985,1271,733,1183,236,982

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-11-28ANONYMOUSv4_computers2048204800--0.0010.687%
2009-07-03Carsten Kossendeymother15000161250--0.0031.564%
2010-12-23JossManual testing2000020000--0.0020.641%
2011-01-23JossManual testing5000050000--0.0061.160%
2011-09-27markrtiny19500049237506--0.0565.761%
2017-06-28JossManual testing39000039000006--0.0725.894%
2019-10-23masserManual testing28800002880000012--0.5309.706%
2020-03-05masserManual testing500000020000000012--1.92813.190%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2016-02-23Mark RoseManual testing212600.053
2009-02-13Sturle Sundegopher.ifi2602610.053
2012-01-20markroldgamer2612620.107
2013-01-10dbaughManual testing2622630.341
2015-04-21VictordeHollanderManual testing2632640.683
2015-04-21VictordeHollanderManual testing2642651.299
2016-02-19YxinityManual testing2652662.598
2017-11-12Gordon SpenceManual testing2662675.196
2019-01-10chuenkitManual testing26726810.39


ECM factoring results:
Total ECM effort:4.984 GHz-days
Estimated T-Level:20.854
DigitsB1CompleteFacMiss
20110001.84615.784%
25500000.17184.297%
302500000.01198.928%


ECM Summary

B1B2factorcurvesGHz-days
500005000000454.670
50000500000030.314


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-01-13ANONYMOUSv4_computersFA0D0BB811299E4D0.222
1999-05-16ANONYMOUSv4_computersFA0D0BB811299E4D0.222
2018-09-23kkmrkkblmbrbkoldFA0D0BB811299E4D0.222


PRP results:
dateuseridcompidcofactorsres64
2020-12-09mrhi
1250068633608583638374311
9DEF0819CC2C2B48


CERT results:
dateuseridcompid
2020-12-09Wakaba_SRX-78-1


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 = 390000, B2 = 3900000 (P-1 stage 2)
B1 = 195000, B2 = 4923750 (P-1 stage 2)
B1 = 390000 (P-1 stage 1)
B1 = 195000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 15000, B2 = 161250 (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)
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107
100
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109
1010
1011
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1015
TF factor-bounds graph:
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267
266
265
264
263
262
261
260
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=20.85 ~= 53-bit
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Last modified: 2024-02-29T14:28:04+00:00