is 2 12905411 - 1
has 3884916 decimal digits
takes 5.272 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L13ED7A94DBDA0FA4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2699.250965.2174%30000060000000.36164.1557%9.612566.6628%1.4455%
PrimeNet2640.275862.5000%6000017000000.08854.3326%0.364364.1247%1.6247%
GPU722684.618664.7059%9000024000000.12783.1654%4.746465.8231%1.1172%
Difference+1+4.6323+0.5115%+210000+3600000+0.2338+0.9903%+4.8661+0.8398%+0.8398%

Known prime factors (1 factor, 75.9 bits, 0.00058834% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12905411718529715627185918329192375.9272783831199282169
30133 × 92384800693
2019-10-173013392384800693884.132,981.25,568.0

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-22T00:00:00ANONYMOUSv4_computers1350001046250---0.109--2.461%
2015-12-18T19:27:30ThaRiet-Ubuntu300000600000012---0.362--4.156%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-04-27T00:00:00ANONYMOUSv4_computers21264--0.276--
2013-06-01T06:14:00lycornManual testing264265--0.290--
2014-05-12T08:07:00NesowaManual testing265266--0.579--
2015-04-14T11:46:00ThaManual testing266267--1.158--
2018-01-07T23:35:08ramgeisManual testing267268--2.316--
2018-01-07T23:35:08ramgeisManual testing268269--4.632--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.242 GHz-days
Estimated T-Level:0.100
DigitsB1CurvesCompleteFacMiss
20110002 / 1000.02098.010%
25500002 / 2800.00799.287%

New Calculation Method

Total ECM effort:1.242 GHz-days
Estimated T-Level:0.100
DigitsB1CompleteFacMiss
20110000.06593.752%
25500000.00699.419%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.621
50000500000010.621


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-07-27T00:00:00ANONYMOUSv4_computers13ED7A94DBDA0FA45.272
2004-10-03T00:00:00Donna Noblev4_computers13ED7A94DBDA0FA45.272


PRP results:
No PRP results for M12905411


P-1 factor-bounds graph:
B1 = 300000, B2 = 6000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 135000, B2 = 1046250 (P-1 stage 2)
B1 = 135000 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2019-10-17T15:29:20+00:00