is 2 5377121 - 1
has 1618675 decimal digits
takes 0.849 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L9175E5C00A58CE53double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26811.084966.1765 %8500012112500.03352.3330 %11.118466.9656 %
Target2662.746565.1515 %3200032500000.04752.0740 %2.794065.8743 %
Difference+2+8.3384+1.0250 %+53000-2038750-0.0140+0.2590%+8.3244+1.0913 %

Known prime factors (1 factor, 95.2 bits, 0.00177074% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5377121459697113606781417048858047772995.2154274565456187255383028
22 × 7 × 19 × 43 × 197 × 16333 × 65789 × 882727
2019-07-05657898827271.501e+90.02530.0307

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2000-06-11ANONYMOUSv4_computers25000281250--0.0091.545%
2010-09-29Squeeky_SquirrelP4_2600600009600006--0.0282.627%
2019-07-05Ivan MUnlinkedGD850001211250622995.2150.0322.963%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-03-31S00030v4_computers212620.057
2009-05-19GrunwalderGIMPManual testing2622630.183
2014-12-24VictordeHollanderManual testing2632651.060
2015-08-19snme2pm1Manual testing2652661.390
2016-08-11Gordon SpenceManual testing2662672.779
2018-06-19ramgeisManual testing2672685.559


ECM factoring results:
Total ECM effort:1.979 GHz-days
Estimated T-Level:1.731
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.979


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-08-09ANONYMOUSv4_computers9175E5C00A58CE530.849
2000-06-23ANONYMOUSv4_computers9175E5C00A58CE530.849


PRP results:
dateuseridcompidcofactorsres64
2019-07-06Niels_Mache_NextcloudSuperDry3
45969711360678141704885804777
CA04865378AE9EEE
2019-07-06ATHec2-PRPCFDC
45969711360678141704885804777
CA04865378AE9EEE


CERT results:
No CERT results for M5377121


P-1 factor-bounds graph:
B1 = 85000, B2 = 1211250 (P-1 stage 2)
B1 = 60000, B2 = 960000 (P-1 stage 2)
B1 = 85000 (P-1 stage 1)
B1 = 60000 (P-1 stage 1)
B1 = 25000, B2 = 281250 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
103
104
105
106
107
TF factor-bounds graph:
268
267
266
265
263
262
this exponent TF target: 66
TF double-checked to: 67
ECM T-Level=1.73 ~= -11-bit
250
260
270
280
290
2100
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Last modified: 2024-03-13T02:15:48+00:00