is 2 12905407 - 1
has 3884915 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-L7379A86C83E09403double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27274.103366.6667%60000062074740020.36717.1940%94.470469.0647%2.3980%
PrimeNet2640.275862.5000%6000017000000.08854.3326%0.364364.1247%1.6247%
GPU722684.618664.7059%9000024000000.12783.1654%4.746465.8231%1.1172%
Difference+4+69.4847+1.9608%+510000+618347400+20.2392+4.0286%+89.7240+3.2416%+3.2416%

Known prime factors:
No known factors for M12905407

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-06-17T00:00:00ANONYMOUSv4_computers200000200000---0.118--0.943%
2001-09-22T00:00:00Luigi Morelliv4_computers1550002286250---0.161--2.176%
2015-05-07T08:35:00ThaManual testing3000006000000---0.362--3.042%
2021-12-24T20:06:57Luminescence5950X600000620747400---20.37--7.194%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-04-19T00:00:00ANONYMOUSv4_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--
2018-01-07T23:33:16ramgeisManual testing267268--2.316--
2018-01-07T23:33:16ramgeisManual testing268269--4.632--
2021-08-07T06:04:30SRBaseManual testing269270--9.265--
2021-08-31T20:13:58SRBaseManual testing270271--18.53--
2021-10-29T20:16:00-Anonymous-Manual testing271272--37.06--


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
20110000.07792.596%
25500000.00799.291%


ECM Summary

B1B2factorcurvesGHz-days
50000500000021.242


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2001-12-08T00:00:00Luigi Morelliv4_computers7379A86C83E094035.272
2004-09-16T00:00:00Team Prime Ribv4_computers7379A86C83E094035.272


PRP results:
No PRP results for M12905407


P-1 factor-bounds graph:
B1 = 600000, B2 = 620747400 (P-1 stage 2)
B1 = 300000, B2 = 6000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
B1 = 155000, B2 = 2286250 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 155000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-12-24T20:06:57+00:00