is 2 1384387 - 1
has 416743 decimal digits
takes 0.053 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP68CB4C00710D69__verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26843.055169.1176%31069001118490000.50007.5803%43.555171.4586%2.3410%
PrimeNet2560.006962.5000%65001100000.00072.7561%0.007663.5336%1.0336%
GPU722600.110965.0000%5500700000.00051.2006%0.111465.4202%0.4202%
Difference+8+42.9441+4.1176%+3101400+111779000+0.4995+6.3797%+43.4436+6.0384%+6.0384%

Known prime factors:
No known factors for M1384387

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers15000228750---0.001--0.695%
2014-04-15T00:10:00ANONYMOUSManual testing110000110000---0.006--0.780%
2014-04-22T10:35:00Jocelyn LaroucheManual testing200000200000---0.011--1.091%
2014-09-22T10:58:00mikrMSI3106900111849000---0.500--7.580%
2018-10-05T11:44:17Jocelyn Larouchelow 4M13843871384387012---0.114--4.865%
2018-10-14T10:45:15Jocelyn Larouchelow 4M138438715228257012---0.532--7.369%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-03T00:00:00ANONYMOUSv4_computers21257--0.014--
2003-07-06T00:00:00ANONYMOUSv4_computers21258--0.028--
2016-02-23T16:28:29Mark RoseManual testing258260--0.083--
2009-02-14T11:07:00Sturle Sundehoffman.ifi260261--0.111--
2012-07-19T22:52:00Grant McCrackenthumper261262--0.222--
2013-01-27T10:09:00dbaughManual testing262263--0.709--
2015-04-19T02:56:00snme2pm1Manual testing263264--1.418--
2015-04-19T02:56:00snme2pm1Manual testing264265--2.699--
2015-10-12T09:32:51ramgeisManual testing265266--5.398--
2018-04-16T13:13:04TJAOIManual testing266267--10.80--
2020-02-27T11:30:31Gordon SpenceManual testing267268--21.59--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.326 GHz-days
Estimated T-Level:25.383
DigitsB1CurvesCompleteFacMiss
2011000306 / 1003.0604.617%
2550000306 / 2801.09333.460%
3025000049 / 6400.07792.624%

New Calculation Method

Total ECM effort:25.326 GHz-days
Estimated T-Level:25.383
DigitsB1CompleteFacMiss
201100014.7850.000%
25500001.65719.071%
302500000.14086.896%
3510000000.01099.029%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025712.07
250000350000004913.26


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2016-06-02T10:51:49MadPooManual testingBCBBC117507B25__0.053


PRP results:
dateuseridcompidcofactorsres64PRP
2020-11-06T21:08:36Ethan O'ConnorHighland202068CB4C00710D69__no


P-1 factor-bounds graph:
B1 = 1384387, B2 = 152282570 (P-1 stage 2)
B1 = 3106900, B2 = 111849000 (P-1 stage 2)
B1 = 3106900 (P-1 stage 1)
B1 = 1384387, B2 = 13843870 (P-1 stage 2)
B1 = 1384387 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 110000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-10-14T13:09:40+00:00