is 2 4679929 - 1
has 1408800 decimal digits
takes 0.616 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LF908AE32B8244C87double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2676.349265.6716 %14500029725000.05713.4814 %6.406366.8667 %
Target2651.558964.6154 %3000030000000.03662.2310 %1.595665.4048 %
Difference+2+4.7903+1.0563 %+115000-27500+0.0205+1.2503%+4.8108+1.4619 %

Known prime factors (1 factor, 75.1 bits, 0.00160513% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4679929410265209853135646776712375.1194383241816843115
5 × 19 × 4756811 × 9699647
2013-09-16475681196996471,635.00.95961.8483

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-09-04Carsten Kossendeymother25000381250--0.0091.891%
2013-08-01Squeeky_SquirrelT7500_220014500029725006--0.0574.329%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-09-27Stephen Woodv4_computers212610.033
2010-07-07markroldgamer2612620.066
2011-12-11GrunwalderGIMPManual testing212630.341


ECM factoring results:
Total ECM effort:1.017 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.622
50000500000030.395


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-25Stephen Woodv4_computersF908AE32B8244C870.616
2000-03-01korvav4_computersF908AE32B8244C870.616
2002-11-02korvav4_computersF908AE32B8244C870.616


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
41026520985313564677671
5C458C209DB178EA
2018-03-07Oliver KruseGTX-2
41026520985313564677671
5C458C209DB178EA


CERT results:
No CERT results for M4679929


P-1 factor-bounds graph:
B1 = 145000, B2 = 2972500 (P-1 stage 2)
B1 = 145000 (P-1 stage 1)
B1 = 25000, B2 = 381250 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
TF factor-bounds graph:
263
262
261
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
260
270
280
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Last modified: 2024-02-29T14:28:04+00:00