is 2 1649783 - 1
has 496635 decimal digits
takes 0.078 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L990A445251F0FAB1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.010868.6567%2000000200000000.20346.0137%18.214270.5416%1.8849%
PrimeNet2570.011663.1579%70001200000.00092.5634%0.012564.1023%0.9444%
GPU722610.186265.5738%6500800000.00071.1721%0.186965.9773%0.4035%
Difference+6+17.8246+3.0829%+1993500+19920000+0.2027+4.8417%+18.0273+4.5644%+4.5644%

Known prime factors (1 factor, 72.8 bits, 0.00441482% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
164978384234302076749771456872272.8352552890352147821
7 × 364698621735403
2017-12-177364698621735403617.451,355,9272,532,493

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-02-29T17:08:00AxonManual testing100000100000---0.007--0.878%
2012-02-29T17:12:00AxonManual testing200000200000---0.014--1.281%
2012-02-29T18:08:00AxonManual testing300000300000---0.020--1.562%
2012-02-29T18:11:00AxonManual testing400000400000---0.027--1.782%
2012-02-29T19:09:00AxonManual testing500000500000---0.034--1.964%
2012-02-29T19:12:00AxonManual testing600000600000---0.041--2.120%
2012-02-29T20:08:00AxonManual testing700000700000---0.048--2.258%
2012-02-29T20:11:00AxonManual testing800000800000---0.055--2.381%
2012-02-29T21:09:00AxonManual testing900000900000---0.061--2.492%
2012-02-29T21:13:00AxonManual testing10000001000000---0.068--2.594%
2012-03-01T06:08:00AxonManual testing10000008000000---0.094--4.723%
2012-03-01T07:08:00AxonManual testing100000020000000---0.139--5.688%
2017-12-17T12:26:34Jocelyn Larouchelow 4M20000002000000012---0.203--6.014%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-05-19T00:00:00ANONYMOUSv4_computers21258--0.023--
2016-02-23T16:28:44Mark RoseManual testing258260--0.070--
2010-05-01T20:30:00Architects Cubedm1_76l260261--0.093--
2016-02-23T16:28:44Mark RoseManual testing261262--0.186--
2010-08-03T22:36:00GrunwalderGIMPManual testing21263--0.967--
2016-02-23T16:28:44Mark RoseManual testing262263--0.595--
2015-05-07T00:03:00omylistManual testing263264--1.190--
2015-05-07T16:26:00monstManual testing264265--2.265--
2015-10-11T16:52:49ramgeisManual testing265266--4.530--
2017-10-20T14:50:28TJAOIManual testing266267--9.059--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.873 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.873 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024914.75
50000500000020.119


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-14T00:00:00ANONYMOUSv4_computers990A445251F0FAB10.078
2015-07-01T17:36:00MadPooManual testing990A445251F0FAB10.078


PRP results:
dateuseridcompidcofactorsres64PRP
2017-12-19T14:32:59Oliver KruseGTX-1
8423430207674977145687
D9A1CFC4C98297__no
2017-12-19T23:37:03kkmrkkblmbrbkc4.xlarge
8423430207674977145687
D9A1CFC4C98297__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)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
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109
1010
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TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
257
250
260
270
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2100
Last modified: 2019-12-23T11:26:00+00:00