is 2 4174949 - 1
has 1256785 decimal digits
takes 0.521 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF14D78F90B5DC2EFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2677.117267.1642%250003375000.00761.3490%7.124867.6071%0.4429%
PrimeNet2610.073663.9344%170003400000.00632.8317%0.079864.9557%1.0213%
GPU722651.747566.1538%220004500000.00821.8728%1.755766.7877%0.6339%
Difference+2+5.3697+1.0103%+3000-112500-0.0006-0.5238%+5.3691+0.8194%+0.8194%

Known prime factors (1 factor, 62.5 bits, 0.00149720% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
417494965558233140942350631962.507785138131519
7 × 79 × 1419779623
2009-12-017914197796230.267213.98926.128

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-03T18:07:00Carsten Kossendeyleela25000337500---0.008--1.349%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-24T00:00:00ANONYMOUSv4_computers21261--0.074--


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)
1999-12-08T00:00:00ANONYMOUSv4_computersF14D78F90B5DC2EF0.521


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T06:40:05kkmrkkblmbrbkManual testing
6555823314094235063
BC8D555AF23C3D__no
2018-01-16T22:50:55Chang Chia-Tcheexbpc13
6555823314094235063
BC8D555AF23C3D__no


P-1 factor-bounds graph:
B1 = 25000, B2 = 337500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
100
101
102
103
104
105
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
261
250
260
270
280
290
2100
Last modified: 2018-01-16T22:50:55+00:00