is 2 6522287 - 1
has 1963405 decimal digits
takes 1.222 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L95C65FC106CC58FDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2689.138666.1765 %415000123462500.28955.0594 %9.428167.8877 %
Target2674.555865.6716 %3600040000000.06852.0381 %4.624266.3713 %
Difference+1+4.5829+0.5048 %+379000+8346250+0.2210+3.0213%+4.8039+1.5165 %

Known prime factors (1 factor, 81.9 bits, 0.00125605% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
652228745844504273692376804200792581.923351445009041248697
32 × 151 × 258605599000183
2017-04-1315125860559900018375,0863,829,1777,151,836

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2001-06-23vidmarv4_computers2500025000--0.0070.464%
2011-05-25Carsten Kossendeymother4150001234625012--0.2895.573%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-07-29ANONYMOUSv4_computers212620.047
2002-11-24David Campeauv4_computers212630.151
2014-07-20NesowaManual testing2632640.301
2014-07-26lycornManual testing2642650.573
2015-10-29snme2pm1Manual testing2652661.146
2016-04-20Gordon SpenceManual testing2662672.291
2023-04-07LordJuliusManual testing267268


ECM factoring results:
Total ECM effort:1.710 GHz-days
Estimated T-Level:1.154
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.855
50000500000030.855


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-09-07Phantomasv4_computers95C65FC106CC58FD1.222
2001-07-29vidmarv4_computers95C65FC106CC58FD1.222


PRP results:
dateuseridcompidcofactorsres64
2017-12-23Chun sung sooTae-Hee_Lee
4584450427369237680420079
D124FB1BA9868329
2018-10-06Oliver KruseGTX-1
4584450427369237680420079
D124FB1BA9868329


CERT results:
No CERT results for M6522287


P-1 factor-bounds graph:
B1 = 415000, B2 = 12346250 (P-1 stage 2)
B1 = 415000 (P-1 stage 1)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 67
TF double-checked to: 67
ECM T-Level=1.15 ~= -13-bit
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Last modified: 2024-02-09T03:30:02+00:00