is 2 1707257 - 1
has 513936 decimal digits
takes 0.080 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9103DF32252B52C6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26834.912769.1176%100000002000000001.38889.1116%36.301571.9315%2.8139%
PrimeNet2570.011263.1579%80001400000.00102.7894%0.012364.1856%1.0277%
GPU722610.179965.5738%70001000000.00081.3025%0.180766.0222%0.4484%
Difference+7+34.7327+3.5439%+9993000+199900000+1.3880+7.8091%+36.1207+5.9094%+5.9094%

Known prime factors (1 factor, 71.2 bits, 0.00416803% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
170725726362021462018935050572271.159772057793935504
24 × 2473 × 19512176353
2020-03-05247319512176353396.6972.545135.49

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-29T02:01:00Jocelyn LaroucheManual testing5000050000---0.003--0.489%
2011-02-07T12:42:00Carsten Kossendeyleela900001507500---0.011--2.083%
2014-03-31T21:13:00Jocelyn LaroucheManual testing100000100000---0.007--0.766%
2014-04-28T23:56:00ANONYMOUSManual testing150000150000---0.010--0.968%
2014-10-05T22:25:00Jocelyn LaroucheManual testing187595187595---0.013--1.093%
2015-01-07T04:02:00Jocelyn LaroucheManual testing281392281392---0.019--1.344%
2015-02-13T18:00:00Jocelyn LaroucheManual testing374532374532---0.026--1.540%
2015-02-18T11:51:00VictordeHollanderManual testing10000000200000000---1.389--9.112%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:47Mark RoseManual testing258260--0.067--
2010-04-22T12:45:00Architects Cubeda3_bu2260261--0.090--
2016-02-23T16:28:47Mark RoseManual testing261262--0.180--
2010-10-16T22:16:00GrunwalderGIMPManual testing21263--0.935--
2016-02-23T16:28:47Mark RoseManual testing262263--0.575--
2015-02-13T10:43:00VictordeHollanderManual testing263264--1.150--
2015-02-13T10:43:00VictordeHollanderManual testing264265--2.189--
2015-08-31T08:29:00ramgeisManual testing265266--4.377--
2018-06-11T13:42:38TJAOIManual testing266267--8.754--
2019-07-17T09:51:54TJAOIManual testing267268--17.51--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.640 GHz-days
Estimated T-Level:24.696
DigitsB1CurvesCompleteFacMiss
2011000263 / 1002.6307.113%
2550000263 / 2800.93939.025%

New Calculation Method

Total ECM effort:15.640 GHz-days
Estimated T-Level:24.696
DigitsB1CompleteFacMiss
20110008.4840.021%
25500000.76746.451%
302500000.04795.388%
3510000000.00299.784%


ECM Summary

B1B2factorcurvesGHz-days
50000500000026015.46
50000500000030.178


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computers9103DF32252B52C60.080
1999-05-09T00:00:00ANONYMOUSv4_computers9103DF32252B52C60.080
2015-07-19T18:02:00MadPooManual testing9103DF32252B52C60.080


PRP results:
dateuseridcompidcofactorsres64PRP
2020-03-07T19:52:12mnd9mnd2
2636202146201893505057
881A8DDF144AEA14no
2020-03-08T23:08:05Alvin BunkBADCAT
2636202146201893505057
881A8DDF144AEA14no


P-1 factor-bounds graph:
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 374532 (P-1 stage 1)
B1 = 281392 (P-1 stage 1)
B1 = 187595 (P-1 stage 1)
B1 = 90000, B2 = 1507500 (P-1 stage 2)
B1 = 150000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
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102
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1010
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TF factor-bounds graph:
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263
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Last modified: 2020-03-16T11:29:20+00:00