is 2 1647689 - 1
has 496004 decimal digits
takes 0.074 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBC66F96FD748C300double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.033768.6567%2000000200000000.19306.0129%18.226770.5414%1.8846%
PrimeNet2570.011763.1579%70001200000.00092.5627%0.012564.1021%0.9442%
GPU722610.186465.5738%6500800000.00071.1717%0.187165.9772%0.4034%
Difference+6+17.8473+3.0829%+1993500+19920000+0.1924+4.8412%+18.0396+4.5642%+4.5642%

Known prime factors (1 factor, 78.2 bits, 0.00474521% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16476893439108570145213439658092478.186104361580678914936
23 × 32 × 13 × 17 × 6491 × 1010425433
2017-12-156491101042543369,2883.56596.6593

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-02-29T17:07:00AxonManual testing100000100000---0.006--0.878%
2012-02-29T17:12:00AxonManual testing200000200000---0.013--1.281%
2012-02-29T18:07:00AxonManual testing300000300000---0.019--1.562%
2012-02-29T18:11:00AxonManual testing400000400000---0.026--1.782%
2012-02-29T19:09:00AxonManual testing500000500000---0.032--1.964%
2012-02-29T19:12:00AxonManual testing600000600000---0.039--2.120%
2012-02-29T20:08:00AxonManual testing700000700000---0.045--2.257%
2012-02-29T20:11:00AxonManual testing800000800000---0.052--2.380%
2012-02-29T21:09:00AxonManual testing900000900000---0.058--2.492%
2012-02-29T21:13:00AxonManual testing10000001000000---0.065--2.594%
2012-03-01T06:07:00AxonManual testing10000008000000---0.089--4.722%
2012-03-01T07:08:00AxonManual testing100000020000000---0.132--5.687%
2017-08-27T00:26:41Jocelyn Larouchelow 4M20000002000000012---0.193--6.013%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-05-26T00:00:00ANONYMOUSv4_computers21258--0.023--
2016-02-23T16:28:44Mark RoseManual testing258260--0.070--
2010-04-30T05:20:00Architects Cubedm1_76l260261--0.093--
2016-02-23T16:28:44Mark RoseManual testing261262--0.186--
2010-08-03T22:36:00GrunwalderGIMPManual testing21263--0.969--
2016-02-23T16:28:44Mark RoseManual testing262263--0.596--
2015-05-06T17:29:00omylistManual testing263264--1.192--
2015-05-07T09:32:00monstManual testing264265--2.268--
2015-10-11T16:52:49ramgeisManual testing265266--4.535--
2017-10-27T12:33:03TJAOIManual testing266267--9.071--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.114 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.114 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024914.00
50000500000020.112


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-21T00:00:00ANONYMOUSv4_computersBC66F96FD748C3000.074
2015-07-19T18:02:00MadPooManual testingBC66F96FD748C3000.074


PRP results:
dateuseridcompidcofactorsres64PRP
2017-12-22T02:35:10BloodERazorManual testing
343910857014521343965809
824EDED1A204DF__no
2017-12-30T09:04:23treborDesktop
343910857014521343965809
824EDED1A204DF__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1000000, B2 = 8000000 (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)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
257
250
260
270
280
290
2100
Last modified: 2019-11-18T17:51:32+00:00