is 2 6329887 - 1
has 1905486 decimal digits
takes 1.122 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L3938BB06C49745DCdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2689.416466.1765 %600000120000000.31385.2253 %9.730267.9438 %
Target2662.333165.1515 %4500050000000.08092.5680 %2.414166.0464 %
Difference+2+7.0833+1.0250 %+555000+7000000+0.2329+2.6572%+7.3161+1.8974 %

Known prime factors (1 factor, 81.1 bits, 0.00128082% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
632988725455208507731296869713372581.074201071587120996764
22 × 3 × 181 × 4159 × 6011 × 3703013
2019-12-2460113703013100,8800.05330.0968

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-06-14Carsten Kossendeymother35000481250--0.0152.012%
2013-04-29Squeeky_SquirrelT7500_220012000023700006--0.0623.748%
2019-12-25takahashivaio600000120000001222581.0740.3146.308%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-06-29ANONYMOUSv4_computers212620.049
2016-02-23Mark RoseManual testing2622630.155
2014-08-17NesowaManual testing2632640.310
2014-08-23lycornManual testing2642650.590
2015-10-19snme2pm1Manual testing2652661.181
2016-03-25Gordon SpenceManual testing2662672.361
2018-06-04ramgeisManual testing2672684.722


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_computers5796D756C3568A851.122
1999-06-15ANONYMOUSv4_computers3938BB06C49745DC1.122
2001-02-25ANONYMOUSv4_computers3938BB06C49745DC1.122


PRP results:
dateuseridcompidcofactorsres64
2019-12-25Niels_Mache_NextcloudSuperDry-X
2545520850773129686971337
32CACF8E470F0F13
2019-12-26mnd9printer
2545520850773129686971337
32CACF8E470F0F13


CERT results:
No CERT results for M6329887


P-1 factor-bounds graph:
B1 = 600000, B2 = 12000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 120000, B2 = 2370000 (P-1 stage 2)
B1 = 120000 (P-1 stage 1)
B1 = 35000, B2 = 481250 (P-1 stage 2)
B1 = 35000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
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