is 2 4394371 - 1
has 1322838 decimal digits
takes 0.548 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8565090C97CA669Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2676.761865.6716%250003562500.00781.3836%6.769666.1466%0.4750%
PrimeNet2610.069962.2951%180003600000.00662.9368%0.076563.4024%1.1073%
GPU722651.660264.6154%260005000000.00942.0314%1.669665.3342%0.7188%
Difference+2+5.1016+1.0563%-1000-143750-0.0016-0.6477%+5.1000+0.8125%+0.8125%

Known prime factors (1 factor, 81.2 bits, 0.00184748% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
439437127488419010576823881738412581.185312768528312434520
23 × 3 × 5 × 461 × 5653805645561
2010-01-104615653805645561123,02455,707104,046

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-02T02:37:00Carsten Kossendeydurandal25000356250---0.008--1.384%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2002-02-10T00:00:00ANONYMOUSv4_computers21261--0.070--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-05-08T00:00:00ANONYMOUSv4_computers8565090C97CA669F0.548
1999-12-30T00:00:00ANONYMOUSv4_computers8565090C97CA669F0.548


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T18:06:09kkmrkkblmbrbkManual testing
2748841901057682388173841
46F59394B3B147__no
2018-02-08T21:45:55Oliver KruseGTX-3
2748841901057682388173841
46F59394B3B147__no


P-1 factor-bounds graph:
B1 = 25000, B2 = 356250 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
101
102
103
104
105
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
267
261
250
260
270
280
290
2100
Last modified: 2018-02-08T21:45:55+00:00