is 2 4869167 - 1
has 1465766 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-LA77EFD6421EFE79Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2676.102565.6716%410000110700000.19915.2646%6.301667.4789%1.8072%
PrimeNet2610.063162.2951%220004500000.00913.2987%0.072263.5388%1.2438%
GPU722651.498364.6154%320007000000.01372.3715%1.512165.4545%0.8391%
Difference+2+4.6041+1.0563%+378000+10370000+0.1854+2.8931%+4.7895+2.0244%+2.0244%

Known prime factors (1 factor, 67.9 bits, 0.00139381% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
48691672691613637906092841212167.86727639364576180
22 × 5 × 72 × 1579 × 17861579
2017-04-151579178615796.47450.19590.3653

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-16T19:46:00Carsten Kossendeydurandal30000435000---0.010--1.570%
2013-12-20T13:26:00David Campeaui5-2500k41000011070000---0.199--5.265%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:03Mark RoseManual testing21261--0.063--
2010-04-23T00:43:00markroldgamer261262--0.063--
2011-10-09T22:43:00GrunwalderGIMPManual testing21263--0.328--
2016-02-23T16:39:03Mark RoseManual testing262263--0.202--
2015-01-09T11:16:00VictordeHollanderManual testing263264--0.403--
2015-01-09T11:16:00VictordeHollanderManual testing264265--0.767--
2015-07-21T21:29:00snme2pm1Manual testing265266--1.535--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.675 GHz-days
Estimated T-Level:0.400
DigitsB1CurvesCompleteFacMiss
20110008 / 1000.08092.274%
25500008 / 2800.02997.178%

New Calculation Method

Total ECM effort:1.675 GHz-days
Estimated T-Level:0.400
DigitsB1CompleteFacMiss
20110000.30873.514%
25500000.02897.193%
302500000.00299.821%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.256
50000500000020.419


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-01T00:00:00Kimon Berlinv4_computersA77EFD6421EFE79C0.675
2000-03-22T00:00:00Stephan Gruppv4_computersA77EFD6421EFE79C0.675


PRP results:
dateuseridcompidcofactorsres64PRP
2017-11-20T10:27:19kkmrkkblmbrbkc4.xlarge
269161363790609284121
28C7D6D9B23225__no
2018-04-01T15:42:52Oliver KruseGTX-6
269161363790609284121
28C7D6D9B23225__no


P-1 factor-bounds graph:
B1 = 410000, B2 = 11070000 (P-1 stage 2)
B1 = 410000 (P-1 stage 1)
B1 = 30000, B2 = 435000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
266
265
264
263
262
261
250
260
270
280
290
2100
Last modified: 2018-04-01T15:42:52+00:00