is 2 1304987 - 1
has 392841 decimal digits
takes 0.041 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L9D1B3C80976A34DCdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26722.769568.6567 %500000150000000.05934.8656 %22.828870.1818 %
Target2600.117765.0000 %55001800000.00070.9358 %0.118465.3275 %
Difference+7+22.6518+3.6567 %+494500+14820000+0.0586+3.9299%+22.7104+4.8542 %

Known prime factors (1 factor, 48.2 bits, 0.00369327% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
13049873225992304258071548.197123602469
3 × 41200823
-3412008232.873e-50.10320.1927

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-17alpertronManual testing5000001500000012---9.338%


Trial Factoring results:
5758596061626364656667
No TF results for M1304987


ECM factoring results:
Total ECM effort:20.915 GHz-days
Estimated T-Level:25.707
DigitsB1CompleteFacMiss
201100014.7690.000%
25500001.66118.986%
302500000.14186.808%
3510000000.01099.018%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002549.81
250000350000005011.11


Lucas-Lehmer results:
No L-L results for M1304987


PRP results:
dateuseridcompidcofactorsres64
2017-09-30Oliver KruseGTX-3
322599230425807
34E4E19A65249097
2017-10-22kkmrkkblmbrbkc4.xlarge
322599230425807
34E4E19A65249097


CERT results:
No CERT results for M1304987


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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Last modified: 2024-02-09T03:30:02+00:00