is 2 1811287 - 1
has 545252 decimal digits
takes 0.098 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L67B86E3950613CBCdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26832.907569.1176 %2500000069189473430298.388217.9958 %331.295774.6752 %
Target2610.169665.5738 %90006500000.00351.5564 %0.173066.1096 %
Difference+7+32.7379+3.5439 %+24991000+69188823430+298.3847+16.4395%+331.1226+8.5656 %

Known prime factors:
No known factors for M1811287

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2008-11-16George WoltmanManual testing20000270000---2.388%
2011-02-07Carsten Kossendeymother10000016500006--0.0154.922%
2014-05-12JossManual testing135436135436--0.0112.339%
2014-09-20JossManual testing170872170872--0.0132.590%
2015-05-15mikrMSI27800009176000012--0.60012.869%
2018-09-20JossManual testing181128718112870012--0.91113.709%
2023-01-07JossManual testing1811287919969050--4.94216.313%
2023-02-25JossManual testing18112872665000800--14.0117.972%
2023-06-30JossJoss18112876155133600--32.1319.251%
2023-08-26kurlybeans2500000069189473430--298.426.054%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-10-27masserManual testing20000044000007219--0.042
2022-10-27masserManual testing4000001080000065--0.092
2022-10-29masserManual testing8000002560000027--0.200


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-16ANONYMOUSv4_computers212580.021
2010-04-17Architects Cubeda3_bu22602610.085
2011-01-21GrunwalderGIMPManual testing212630.881
2016-02-23Mark RoseManual testing2582630.775
2015-04-22snme2pm1Manual testing2632653.147
2015-09-02ramgeisManual testing2652664.126
2018-04-16TJAOIManual testing2662678.251
2019-07-17TJAOIManual testing26726816.50


ECM factoring results:
Total ECM effort:36.567 GHz-days
Estimated T-Level:25.669
DigitsB1CompleteFacMiss
201100014.5880.000%
25500001.61519.888%
302500000.13487.470%
3510000000.00999.102%


ECM Summary

B1B2factorcurvesGHz-days
50000500000020413.92
500006500000614.710
250000400000004217.94


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13ANONYMOUSv4_computers67B86E3950613CBC0.098
2015-07-10MadPooManual testing67B86E3950613CBC0.098


PRP results:
No PRP results for M1811287


CERT results:
No CERT results for M1811287


P-1 factor-bounds graph:
B1 = 25000000, B2 = 69189473430 (P-1 stage 2)
B1 = 1811287, B2 = 6155133600 (P-1 stage 2)
B1 = 1811287, B2 = 2665000800 (P-1 stage 2)
B1 = 1811287, B2 = 919969050 (P-1 stage 2)
B1 = 25000000 (P-1 stage 1)
B1 = 1811287, B2 = 181128700 (P-1 stage 2)
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 1811287 (P-1 stage 1)
B1 = 100000, B2 = 1650000 (P-1 stage 2)
B1 = 170872 (P-1 stage 1)
B1 = 135436 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 20000, B2 = 270000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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267
266
265
263
261
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.67 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00