is 2 6380849 - 1
has 1920827 decimal digits
takes 1.131 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L31382A372210F6D8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2689.341266.1765 %700000150000000.38015.5438 %9.721368.0516 %
Target2662.314565.1515 %4500050000000.08092.5714 %2.395466.0476 %
Difference+2+7.0267+1.0250 %+655000+10000000+0.2992+2.9724%+7.3259+2.0040 %

Known prime factors (1 factor, 84.4 bits, 0.00132313% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6380849260078105388962828146027692684.4272037958470643662216
23 × 32 × 13 × 701 × 15467 × 200814643
2020-03-25154672008146431,089,2592.81535.2511

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2001-04-29Stephen Woodv4_computers2500025000--0.0060.545%
2011-07-05markrtiny16500035475006--0.0904.286%
2020-03-25takahashivaio700000150000001222684.4270.3806.671%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-07-05ANONYMOUSv4_computers212620.048
2016-02-23Mark RoseManual testing2622630.154
2014-08-17NesowaManual testing2632640.308
2014-08-19lycornManual testing2642650.586
2015-10-22snme2pm1Manual testing2652661.171
2016-04-08Gordon SpenceManual testing2662672.342
2018-06-04ramgeisManual testing2672684.684


ECM factoring results:
Total ECM effort:1.617 GHz-days
Estimated T-Level:1.154
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.617


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07ANONYMOUSv4_computersE87552332B756DB01.131
1999-05-16Albrecht Heefferv4_computers31382A372210F6D81.131
2001-06-17Stephen Woodv4_computers31382A372210F6D81.131


PRP results:
dateuseridcompidcofactorsres64
2020-04-05M Millercruncher
26007810538896282814602769
2EB860F4640D9CB5
2020-04-06ANONYMOUSKL-SCH04
26007810538896282814602769
2EB860F4640D9CB5


CERT results:
No CERT results for M6380849


P-1 factor-bounds graph:
B1 = 700000, B2 = 15000000 (P-1 stage 2)
B1 = 700000 (P-1 stage 1)
B1 = 165000, B2 = 3547500 (P-1 stage 2)
B1 = 165000 (P-1 stage 1)
B1 = 25000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
268
267
266
265
264
263
262
this exponent TF target: 66
TF double-checked to: 67
ECM T-Level=1.15 ~= -13-bit
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Last modified: 2024-03-13T02:15:48+00:00