is 2 1754309 - 1
has 528100 decimal digits
takes 0.095 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3636740CA190405Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.976369.1176%17543091929739900.95758.0021%34.933871.5889%2.4712%
PrimeNet2570.010963.1579%80001400000.00122.8038%0.012164.1909%1.0330%
GPU722610.175165.5738%80001100000.00111.4134%0.176266.0603%0.4866%
Difference+7+33.8012+3.5439%+1746309+192863990+0.9565+6.5887%+34.7576+5.5285%+5.5285%

Known prime factors (1 factor, 77.5 bits, 0.00441741% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17543092129855091984027968858472477.49560703533185545647
33 × 2248279006872061
2020-07-1427224827900687206121,8559,635,56217,996,546

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:36:00Carsten Kossendeyleela950001567500---0.014--2.137%
2014-04-08T23:00:00Jocelyn LaroucheManual testing100000100000---0.008--0.770%
2014-05-06T21:04:00Jocelyn LaroucheManual testing136587136587---0.011--0.923%
2014-09-16T20:52:00ANONYMOUSManual testing173174173174---0.014--1.052%
2015-04-25T12:47:00Squeeky_SquirrelP4_26001300003640000---0.025--2.773%
2015-07-04T12:23:00mikrMSI3642200123456789---0.800--7.976%
2018-10-02T11:45:36Jocelyn Larouchelow 4M175430914034472012---0.732--7.644%
2018-10-03T11:47:46Jocelyn Larouchelow 4M175430915788781012---0.807--7.776%
2018-10-07T10:38:35Jocelyn Larouchelow 4M175430917543090012---0.882--7.895%
2018-10-19T02:38:28Jocelyn Larouchelow 4M175430919297399012---0.958--8.002%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:50Mark RoseManual testing258260--0.066--
2010-04-21T12:38:00Architects Cubedi4l_1260261--0.088--
2016-02-23T16:28:50Mark RoseManual testing261262--0.175--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.910--
2016-02-23T16:28:50Mark RoseManual testing262263--0.560--
2015-05-13T21:10:00snme2pm1Manual testing263264--1.119--
2015-05-13T21:10:00snme2pm1Manual testing264265--2.130--
2015-09-05T13:49:00ramgeisManual testing265266--4.260--
2018-06-04T13:10:08TJAOIManual testing266267--8.519--
2019-06-24T09:36:07TJAOIManual testing267268--17.04--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.287 GHz-days
Estimated T-Level:24.750
DigitsB1CurvesCompleteFacMiss
2011000266 / 1002.6606.902%
2550000266 / 2800.95038.608%

New Calculation Method

Total ECM effort:18.287 GHz-days
Estimated T-Level:24.750
DigitsB1CompleteFacMiss
20110008.5810.019%
25500000.77646.047%
302500000.04895.337%
3510000000.00299.782%


ECM Summary

B1B2factorcurvesGHz-days
50000500000026318.08
50000500000030.206


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00MadPoov4_computers3636740CA190405B0.095
2015-07-18T19:04:00MadPooManual testing3636740CA190405B0.095


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-15T07:14:31Chang Chia-Tchehomura
212985509198402796885847
929F634430E3D076no
2020-07-15T08:56:38oodairacom2
212985509198402796885847
929F634430E3D076no
2020-07-15T14:01:22kotenok2000shodan1
212985509198402796885847
929F634430E3D076no


P-1 factor-bounds graph:
B1 = 1754309, B2 = 192973990 (P-1 stage 2)
B1 = 1754309, B2 = 175430900 (P-1 stage 2)
B1 = 1754309, B2 = 157887810 (P-1 stage 2)
B1 = 3642200, B2 = 123456789 (P-1 stage 2)
B1 = 1754309, B2 = 140344720 (P-1 stage 2)
B1 = 3642200 (P-1 stage 1)
B1 = 1754309 (P-1 stage 1)
B1 = 130000, B2 = 3640000 (P-1 stage 2)
B1 = 95000, B2 = 1567500 (P-1 stage 2)
B1 = 173174 (P-1 stage 1)
B1 = 136587 (P-1 stage 1)
B1 = 130000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-07-27T11:05:22+00:00