is 2 1640929 - 1
has 493969 decimal digits
takes 0.073 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L01D02F4BBD68536Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26836.323969.1176%20000001805021900.75947.9732%37.083371.5799%2.4623%
PrimeNet2570.011763.1579%70001200000.00092.5607%0.012664.1013%0.9434%
GPU722610.187265.5738%6500700000.00061.1200%0.187865.9593%0.3856%
Difference+7+36.1367+3.5439%+1993500+180432190+0.7588+6.8532%+36.8954+5.6206%+2.0767%

Known prime factors:
No known factors for M1640929

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-04-09T00:00:00ANONYMOUSv4_computers1000001000000---0.010--1.897%
2012-03-05T17:06:00AxonManual testing200000200000---0.013--1.123%
2012-03-05T17:06:00AxonManual testing300000300000---0.019--1.378%
2012-03-05T17:06:00AxonManual testing400000400000---0.026--1.578%
2012-03-05T17:06:00AxonManual testing500000500000---0.032--1.744%
2012-03-05T17:06:00AxonManual testing600000600000---0.039--1.888%
2012-03-05T17:06:00AxonManual testing700000700000---0.045--2.014%
2012-03-05T17:06:00AxonManual testing800000800000---0.052--2.127%
2012-03-05T17:06:00AxonManual testing900000900000---0.058--2.230%
2012-03-05T17:06:00AxonManual testing10000001000000---0.065--2.324%
2012-03-05T17:06:00AxonManual testing10000008000000---0.089--4.289%
2012-03-05T17:06:00AxonManual testing100000020000000---0.132--5.184%
2017-10-13T14:16:25Jocelyn Larouchelow 4M20000002000000012---0.193--5.499%
2018-02-07T21:17:45Jocelyn Larouchelow 4M20000004000000012---0.264--6.269%
2018-02-18T21:38:36Jocelyn Larouchelow 4M20000008000000012---0.405--7.049%
2018-06-11T11:43:00Jocelyn Larouchelow 4M200000016409290012---0.702--7.864%
2018-10-15T23:03:16Jocelyn Larouchelow 4M200000018050219012---0.759--7.973%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.023--
2016-02-23T16:28:43Mark RoseManual testing258260--0.070--
2010-04-29T06:20:00Architects Cubedm1_76l260261--0.094--
2016-02-23T16:28:43Mark RoseManual testing261262--0.187--
2010-07-30T00:03:00GrunwalderGIMPManual testing21263--0.973--
2016-02-23T16:28:43Mark RoseManual testing262263--0.598--
2015-05-04T10:20:00omylistManual testing263264--1.196--
2015-05-04T20:10:00monstManual testing264265--2.277--
2015-10-11T16:53:03ramgeisManual testing265266--4.554--
2017-11-03T14:18:45TJAOIManual testing266267--9.108--
2019-08-23T11:48:32TJAOIManual testing267268--18.22--


ECM factoring results:
Total ECM effort:15.907 GHz-days
Estimated T-Level:25.318
DigitsB1CompleteFacMiss
201100010.8850.002%
25500001.00736.527%
302500000.06493.845%
3510000000.00399.704%


ECM Summary

B1B2factorcurvesGHz-days
50000500000028315.91


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-07T00:00:00ANONYMOUSv4_computers01D02F4BBD68536A0.073
2015-06-27T00:54:00MadPooManual testing01D02F4BBD68536A0.073


PRP results:
No PRP results for M1640929


P-1 factor-bounds graph:
B1 = 2000000, B2 = 180502190 (P-1 stage 2)
B1 = 2000000, B2 = 164092900 (P-1 stage 2)
B1 = 2000000, B2 = 80000000 (P-1 stage 2)
B1 = 2000000, B2 = 40000000 (P-1 stage 2)
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, B2 = 1000000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
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109
TF factor-bounds graph:
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Last modified: 2019-08-23T11:48:32+00:00