is 2 1764557 - 1
has 531185 decimal digits
takes 0.096 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26716.839368.6567 %500000150000000.10155.0464 %16.940870.2384 %
Target2610.174165.5738 %80006000000.00321.4534 %0.177366.0741 %
Difference+6+16.6652+3.0829 %+492000+14400000+0.0983+3.5929%+16.7635+4.1643 %

Known prime factors (2 factors, 112.3 bits, 0.00636158% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17645574740588253931238.786134328
23 × 3 × 29 × 193
-291932.232e-82.984e-64.643e-6
1764557130587376350910954855912373.4673700287844226935
5 × 13 × 1231 × 122471 × 377599
2015-06-021224713775991,111.00.01070.0196

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2015-06-02alpertronManual testing500000150000001222373.4670.1018.830%


Trial Factoring results:
5758596061626364656667
No TF results for M1764557


ECM factoring results:
Total ECM effort:87.568 GHz-days
Estimated T-Level:25.909
DigitsB1CompleteFacMiss
201100016.1250.000%
25500001.99013.663%
302500000.18283.378%
3510000000.01498.648%


ECM Summary

B1B2factorcurvesGHz-days
50000500000026017.89
2500002099978094969.68


Lucas-Lehmer results:
No L-L results for M1764557


PRP results:
dateuseridcompidcofactorsres64
2017-10-03Oliver KruseGTX-3
474058825393
13058737635091095485591
7438D122985049D6
2017-11-04ATHec2-1xh
474058825393
13058737635091095485591
7438D122985049D6


CERT results:
No CERT results for M1764557


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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105
106
100
101
102
103
104
105
106
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108
TF factor-bounds graph:
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.91 ~= 69-bit
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JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00