is 2 2175587 - 1
has 654917 decimal digits
takes 0.143 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7E24744AC01EDC8Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26827.397167.6471%50000002000000001.48968.9477%28.886770.5419%2.8949%
PrimeNet2580.017662.0690%100001800000.00182.8572%0.019563.1527%1.0838%
GPU722620.282464.5161%110001600000.00181.5681%0.284265.0726%0.5564%
Difference+6+27.1148+3.1309%+4989000+199840000+1.4877+7.3796%+28.6025+5.4694%+5.4694%

Known prime factors (1 factor, 70.6 bits, 0.00324309% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
217558717359730884893057527992270.556398966598092677
398966598092677
2020-02-031398966598092677172.092,072,3323,870,540

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-03-07T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.226%
2010-11-05T01:17:00Jocelyn LaroucheManual testing1500015000---0.001--0.198%
2010-11-07T21:16:00Jocelyn LaroucheManual testing3000030000---0.003--0.354%
2011-01-15T07:04:00markrtiny900001620000---0.017--2.203%
2014-06-13T02:40:00Jocelyn LaroucheManual testing119502119502---0.011--0.890%
2014-10-05T22:22:00Jocelyn LaroucheManual testing149004149004---0.014--1.007%
2015-12-22T14:03:56HBendtzManual testing7000002100000012---0.172--5.205%
2019-11-18T13:57:29mikrMSI500000020000000012---1.490--8.948%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-29T00:00:00ANONYMOUSv4_computers21258--0.018--
2016-02-23T16:29:07Mark RoseManual testing258260--0.053--
2009-01-04T18:14:00Sturle Sundeantonov.ifi260261--0.071--
2009-01-06T21:46:00Sturle Sundegonsha.ifi261262--0.141--
2013-09-09T08:39:00ramgeisManual testing262263--0.451--
2015-03-25T10:09:00VictordeHollanderManual testing263264--0.902--
2015-03-25T10:09:00VictordeHollanderManual testing264265--1.717--
2016-01-02T13:50:57ramgeisManual testing265266--3.435--
2016-11-17T17:00:11Gordon SpenceManual testing266267--6.870--
2019-04-29T13:20:33TJAOIManual testing267268--13.74--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.676 GHz-days
Estimated T-Level:2.150
DigitsB1CurvesCompleteFacMiss
201100043 / 1000.43064.910%
255000043 / 2800.15485.740%

New Calculation Method

Total ECM effort:3.676 GHz-days
Estimated T-Level:2.150
DigitsB1CompleteFacMiss
20110001.38724.980%
25500000.12588.218%
302500000.00899.231%


ECM Summary

B1B2factorcurvesGHz-days
500005000000423.590
50000500000010.085


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-14T00:00:00ANONYMOUSv4_computers7E24744AC01EDC8E0.143
2018-04-12T20:46:38kkmrkkblmbrbkold7E24744AC01EDC8E0.143


PRP results:
dateuseridcompidcofactorsres64PRP
2020-02-04T16:04:25Christoph ZengerManual testing
1735973088489305752799
BB9B866DF2007F7Bno
2020-02-06T05:54:38Chang Chia-Tcheexbbbe-lt
1735973088489305752799
BB9B866DF2007F7Bno


P-1 factor-bounds graph:
B1 = 5000000, B2 = 200000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 700000, B2 = 21000000 (P-1 stage 2)
B1 = 700000 (P-1 stage 1)
B1 = 90000, B2 = 1620000 (P-1 stage 2)
B1 = 149004 (P-1 stage 1)
B1 = 119502 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-02-06T05:54:38+00:00