is 2 1408087 - 1
has 423877 decimal digits
takes 0.054 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L92C5222362E70CF2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26721.102368.6567 %2500000625000000.31947.3846 %21.421770.9713 %
Target2600.109165.0000 %60003500000.00141.2442 %0.110465.4355 %
Difference+7+20.9933+3.6567 %+2494000+62150000+0.3180+6.1405%+21.3113+5.5359 %

Known prime factors (1 factor, 70.9 bits, 0.00503215% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
140808721383421867680103377292270.857759307552291872
25 × 33 × 17 × 51695775619
2016-10-113251695775619169.70155.93291.23

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-21Team Prime Ribv4_computers15000228750--0.0012.341%
2003-09-21Xyzzyv4_computers15000228750--0.0012.341%
2009-07-11markrlounge20000050000006--0.0307.166%
2014-11-06JossManual testing245582245582--0.0163.262%
2015-01-13JossManual testing368373368373--0.0243.800%
2015-02-13JossManual testing405210405210--0.0263.932%
2015-02-15alpertronManual testing20000006000000012--0.33412.597%
2016-08-14Bruno Victal5820K.ECM25000006250000012--0.31912.796%
2016-08-27Bruno VictalManual testing25000006250000012---12.796%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-10-25ANONYMOUSv4_computers212570.014
2003-07-13ANONYMOUSv4_computers212580.027
2016-02-23Mark RoseManual testing2582600.082
2009-02-18Sturle Sundehaydn.ifi2602610.109
2011-01-14BloodIceMjolnir42612620.218
2011-04-05GrunwalderGIMPManual testing212631.133
2016-02-23Mark RoseManual testing2622630.697
2015-03-09snme2pm1Manual testing2632641.394
2015-03-09snme2pm1Manual testing2642652.654
2015-09-27ramgeisManual testing2652665.307


ECM factoring results:
Total ECM effort:29.285 GHz-days
Estimated T-Level:25.704
DigitsB1CompleteFacMiss
201100014.6500.000%
25500001.65119.184%
302500000.14186.863%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024613.06
50000500000010.047
500001544635030.297
250000350000005015.88


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21ANONYMOUSv4_computers92C5222362E70CF20.054
2016-06-02MadPooManual testing92C5222362E70CF20.063


PRP results:
dateuseridcompidcofactorsres64
2017-09-30Oliver KruseGTX-3
2138342186768010337729
56F4BD66D6869092
2017-10-26kkmrkkblmbrbkc4.xlarge
2138342186768010337729
56F4BD66D6869092


CERT results:
No CERT results for M1408087


P-1 factor-bounds graph:
B1 = 2500000, B2 = 62500000 (P-1 stage 2)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 405210 (P-1 stage 1)
B1 = 368373 (P-1 stage 1)
B1 = 245582 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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107
100
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1010
1011
TF factor-bounds graph:
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265
264
263
262
261
260
258
257
this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.7 ~= 69-bit
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Last modified: 2024-02-09T03:30:02+00:00