is 2 1931299 - 1
has 581379 decimal digits
takes 0.105 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L58D87BDD13C4044Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.385568.6567%44000001300000000.88448.8945%16.269971.4445%2.7878%
PrimeNet2580.019963.7931%80001400000.00122.4622%0.021164.6846%0.8915%
GPU722620.318166.1290%8000900000.00101.1507%0.319166.5188%0.3898%
Difference+5+15.0673+2.5277%+4392000+129910000+0.8834+7.7437%+15.9508+4.9257%+4.9257%

Known prime factors (1 factor, 95.8 bits, 0.00495822% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1931299669941272458783027726459519832995.75817344317800060555815709
11 × 191 × 1471 × 2741 × 31237 × 65545087
2016-09-1031237655450877.310e+90.28320.5247

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-24T17:52:00markrtiny2750006000000---0.046--3.944%
2015-10-08T08:25:40Bruno Victal5820K-linux5000001500000012---0.101--5.102%
2016-09-10T08:01:01mikrMSI4400000130000000122995.7580.8840.2101.7698.894%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:58Mark RoseManual testing258260--0.060--
2010-02-06T08:32:00S485122USB-W260261--0.080--
2016-02-23T16:28:58Mark RoseManual testing261262--0.159--
2011-08-27T22:21:00GrunwalderGIMPManual testing21263--0.826--
2016-02-23T16:28:58Mark RoseManual testing262263--0.508--
2015-05-18T07:06:00lycornManual testing263264--1.017--
2015-05-18T07:06:00lycornManual testing264265--1.935--
2015-09-04T17:59:00ramgeisManual testing265266--3.869--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.535 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:19.535 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110008.5640.019%
25500000.77546.082%
302500000.04895.324%
3510000000.00299.780%


ECM Summary

B1B2factorcurvesGHz-days
500005000070.293
500005000000412.849
50000660000020916.39


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-02T00:00:00ANONYMOUSv4_computers58D87BDD13C4044A0.105
2015-07-10T01:00:00MadPooManual testing58D87BDD13C4044A0.105


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T01:14:16Oliver KruseGTX-2
66994127245878302772645951983
DB86CA9F0FFB5C__no
2017-11-10T20:13:32Chang Chia-Tcheexbpc13
66994127245878302772645951983
DB86CA9F0FFB5C__no


P-1 factor-bounds graph:
B1 = 4400000, B2 = 130000000 (P-1 stage 2)
B1 = 4400000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
103
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107
103
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105
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109
TF factor-bounds graph:
267
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265
264
263
262
261
260
258
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290
2100
Last modified: 2022-03-03T12:28:40+00:00