is 2 1642843 - 1
has 494546 decimal digits
takes 0.073 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6BDF4E5E761F6F13double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.086968.6567%1000000200000000.13185.6850%18.218770.4386%1.7819%
PrimeNet2570.011763.1579%70001200000.00092.5613%0.012564.1015%0.9436%
GPU722610.187065.5738%6500800000.00071.1710%0.187765.9769%0.4031%
Difference+6+17.8999+3.0829%+993500+19920000+0.1311+4.5140%+18.0310+4.4617%+4.4617%

Known prime factors (1 factor, 73.5 bits, 0.00447377% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1642843133294809558751068727672373.4974056833475832781
7 × 41 × 2852167 × 4955989
2013-11-22285216749559891,734.20.19210.3759

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-02-29T17:06:00AxonManual testing100000100000---0.006--0.877%
2012-02-29T17:11:00AxonManual testing200000200000---0.013--1.281%
2012-02-29T18:06:00AxonManual testing300000300000---0.019--1.561%
2012-02-29T18:11:00AxonManual testing400000400000---0.026--1.781%
2012-02-29T19:09:00AxonManual testing500000500000---0.032--1.963%
2012-02-29T19:12:00AxonManual testing600000600000---0.039--2.119%
2012-02-29T20:08:00AxonManual testing700000700000---0.045--2.257%
2012-02-29T20:11:00AxonManual testing800000800000---0.052--2.379%
2012-02-29T21:08:00AxonManual testing900000900000---0.058--2.491%
2012-02-29T21:12:00AxonManual testing10000001000000---0.065--2.593%
2012-03-01T06:07:00AxonManual testing10000008000000---0.089--4.720%
2012-03-01T07:08:00AxonManual testing100000020000000---0.132--5.685%
2016-03-17T19:17:47alpertronManual testing5000001500000012---0.084--5.003%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21257--0.012--
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.023--
2010-04-30T16:30:00Architects Cubedm1_76l260261--0.093--
2010-07-30T00:04:00GrunwalderGIMPManual testing21263--0.971--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.941 GHz-days
Estimated T-Level:24.429
DigitsB1CurvesCompleteFacMiss
2011000248 / 1002.4808.270%
2550000248 / 2800.88641.177%

New Calculation Method

Total ECM effort:13.941 GHz-days
Estimated T-Level:24.429
DigitsB1CompleteFacMiss
20110008.0000.034%
25500000.72348.528%
302500000.04595.645%
3510000000.00299.796%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024813.94


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computers6BDF4E5E761F6F130.073


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T17:20:49Oliver KruseGTX-2
13329480955875106872767
C76A0611B59F8A__no
2017-11-02T03:20:45kkmrkkblmbrbkc4.xlarge
13329480955875106872767
C76A0611B59F8A__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000, B2 = 8000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 900000 (P-1 stage 1)
B1 = 800000 (P-1 stage 1)
B1 = 700000 (P-1 stage 1)
B1 = 600000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 400000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
104
105
106
107
104
105
106
107
108
TF factor-bounds graph:
267
263
261
258
257
250
260
270
280
290
2100
Last modified: 2019-11-18T17:50:46+00:00