is 2 4872001 - 1
has 1466619 decimal digits
takes 0.675 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LEC6D021D558D653Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2676.098965.6716%----6.098965.6716%0.0000%
PrimeNet2610.063162.2951%220004500000.00913.2990%0.072263.5390%1.2439%
GPU722651.497564.6154%320007000000.01372.3717%1.511265.4546%0.8392%
Difference+2+4.6014+1.0563%-32000-700000-0.0137-2.3717%+4.5877+0.2170%+0.2170%

Known prime factors (2 factors, 143.6 bits, 0.00294741% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4872001403925995712165410732065.1314145380878536
23 × 41 × 73 × 6143 × 28183
2000-05-106143281832.15350.00150.0025
48720014177941970581522904455912478.46742877063967982795
33 × 5 × 2296367 × 138308851
2019-07-13229636713830885120,7651.95092.8287

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
48720011687579370494788127282939216581195692325914344143.598
P-1 results:
No P-1 results for M4872001


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-05-10T00:00:00ANONYMOUSv4_computers??65.131200.6561.3721.333


ECM factoring results:

Old Calculation Method

Total ECM effort:0.628 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.628 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.09790.776%
25500000.00999.129%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.628


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-05-08T00:00:00ANONYMOUSv4_computersEC6D021D558D653B0.675


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T06:32:48kkmrkkblmbrbkManual testing
40392599571216541073
99FE07F5BF1702__no
2018-04-02T01:07:04Oliver KruseGTX-3
40392599571216541073
99FE07F5BF1702__no
2019-07-14T17:57:32Niels_Mache_NextcloudSuperDry3
40392599571216541073
417794197058152290445591
17C2903BD5C9DFE0no
2019-07-15T17:20:09marssystemsSYSTEM01
40392599571216541073
417794197058152290445591
17C2903BD5C9DFE0no


P-1 factor-bounds graph:
102
103
104
105
106
107
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
2
250
260
270
280
290
2100
Last modified: 2019-07-15T17:20:09+00:00