is 2 1757363 - 1
has 529019 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-LAF9865C98CF3A6A8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.917269.1176%17573631933099300.95928.0068%34.876471.5903%2.4727%
PrimeNet2570.010963.1579%80001400000.00122.8047%0.012164.1912%1.0333%
GPU722610.174865.5738%80001100000.00111.4139%0.175966.0605%0.4868%
Difference+7+33.7424+3.5439%+1749363+193199930+0.9581+6.5929%+34.7005+5.5298%+5.5298%

Known prime factors (1 factor, 75.0 bits, 0.00427024% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1757363389368327582340317089912375.04411078198630059365
32 × 5 × 7 × 9187 × 3828114133
2019-11-30918738281141338,015.816.40730.642

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:40:00Carsten Kossendeyleela950001567500---0.014--2.137%
2014-04-08T23:01:00Jocelyn LaroucheManual testing100000100000---0.008--0.770%
2014-05-09T20:31:00Jocelyn LaroucheManual testing136523136523---0.011--0.923%
2014-09-17T22:20:00ANONYMOUSManual testing173046173046---0.014--1.052%
2015-04-27T09:58:00mikrMSI247540086660000---0.556--7.322%
2018-08-13T11:55:06Jocelyn Larouchelow 4M175736317573630012---0.884--7.899%
2018-10-19T02:38:29Jocelyn Larouchelow 4M175736319330993012---0.959--8.007%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:28:50Mark RoseManual testing21260--0.087--
2010-04-23T08:07:00Architects Cubedi4l_1260261--0.087--
2016-02-23T16:28:50Mark RoseManual testing261262--0.175--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.908--
2016-02-23T16:28:50Mark RoseManual testing262263--0.559--
2015-05-14T02:58:00snme2pm1Manual testing263264--1.117--
2015-05-14T02:58:00snme2pm1Manual testing264265--2.126--
2015-09-06T20:47:00ramgeisManual testing265266--4.252--
2018-05-21T16:49:47TJAOIManual testing266267--8.504--
2019-06-17T12:15:04TJAOIManual testing267268--17.01--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.259 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.259 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024917.12
50000500000020.138


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computersAF9865C98CF3A6A80.095
2015-07-10T01:00:00MadPooManual testingAF9865C98CF3A6A80.095


PRP results:
dateuseridcompidcofactorsres64PRP
2019-12-01T07:33:03GANCS-AC
38936832758234031708991
39C0191941745C3Ano
2019-12-05T10:30:06Chang Chia-Tcheexbpc13
38936832758234031708991
39C0191941745C3Ano


P-1 factor-bounds graph:
B1 = 1757363, B2 = 193309930 (P-1 stage 2)
B1 = 1757363, B2 = 175736300 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1757363 (P-1 stage 1)
B1 = 95000, B2 = 1567500 (P-1 stage 2)
B1 = 173046 (P-1 stage 1)
B1 = 136523 (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: 2020-08-14T09:28:58+00:00