is 2 1535587 - 1
has 462258 decimal digits
takes 0.069 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBAF118A42F836E0Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26838.815769.1176%100000002000000001.31819.0259%40.133871.9051%2.7874%
PrimeNet2570.012563.1579%65001100000.00082.4160%0.013364.0480%0.8901%
GPU722610.200065.5738%6500550000.00061.0150%0.200665.9232%0.3494%
Difference+7+38.6157+3.5439%+9993500+199945000+1.3175+8.0109%+39.9332+5.9819%+5.9819%

Known prime factors:
No known factors for M1535587

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-04-14T00:00:00Jocelyn Larouchev4_computers20000280000---0.002--0.843%
2011-02-01T11:03:00James HeinrichWHS800001340000---0.010--1.938%
2013-09-28T09:32:00David Campeaui5-2500k94500027405000---0.155--5.422%
2015-03-03T21:33:00VictordeHollanderManual testing10000000200000000---1.318--9.026%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-18T00:00:00ANONYMOUSv4_computers21257--0.013--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--
2016-02-23T16:28:37Mark RoseManual testing258260--0.075--
2010-04-25T18:20:00Architects Cubeda3_bu2260261--0.100--
2016-02-23T16:28:37Mark RoseManual testing261262--0.200--
2010-05-04T02:59:00GrunwalderGIMPManual testing21263--1.039--
2016-02-23T16:28:37Mark RoseManual testing262263--0.639--
2015-02-08T22:57:00snme2pm1Manual testing263264--1.279--
2015-02-08T22:57:00snme2pm1Manual testing264265--2.433--
2015-10-11T16:52:54ramgeisManual testing265266--4.866--
2018-02-19T12:08:15TJAOIManual testing266267--9.73--
2018-06-06T17:06:47ramgeisManual testing267268--19.47--


ECM factoring results:

Old Calculation Method

Total ECM effort:29.666 GHz-days
Estimated T-Level:25.336
DigitsB1CurvesCompleteFacMiss
2011000326 / 1003.2603.776%
2550000326 / 2801.16431.150%
3025000043 / 6400.06793.497%

New Calculation Method

Total ECM effort:29.666 GHz-days
Estimated T-Level:25.336
DigitsB1CompleteFacMiss
201100015.1850.000%
25500001.65919.040%
302500000.13687.270%
3510000000.00999.088%


ECM Summary

B1B2factorcurvesGHz-days
50000500000028315.80
250000350000004313.86


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-07T00:00:00ANONYMOUSv4_computersBAF118A42F836E0E0.069
2015-07-21T00:53:00MadPooManual testingBAF118A42F836E0E0.069


PRP results:
No PRP results for M1535587


P-1 factor-bounds graph:
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 945000, B2 = 27405000 (P-1 stage 2)
B1 = 945000 (P-1 stage 1)
B1 = 80000, B2 = 1340000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 20000, B2 = 280000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-05-26T10:13:42+00:00