is 2 1870067 - 1
has 562947 decimal digits
takes 0.101 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LB3610BFC2FD77644double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26715.889268.6567 %500000150000000.10155.0818 %15.990770.2495 %
Target2610.164365.5738 %100007500000.00401.6896 %0.168266.1555 %
Difference+6+15.7250+3.0829 %+490000+14250000+0.0975+3.3922%+15.8225+4.0941 %

Known prime factors (1 factor, 66.2 bits, 0.00353935% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1870067840663443662682398872066.18822476826864029
3 × 353 × 21224576831
2013-10-04353212245768317.897390.963169.89

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-01-09markrtiny275000600000012--0.0467.181%
2016-03-16alpertronManual testing5000001500000012---8.885%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-09ANONYMOUSv4_computers212580.021
2010-04-09Architects CubedManual testing2602610.082
2011-03-08GrunwalderGIMPManual testing212630.853


ECM factoring results:
Total ECM effort:39.330 GHz-days
Estimated T-Level:25.708
DigitsB1CompleteFacMiss
201100014.9080.000%
25500001.67318.760%
302500000.14286.794%
3510000000.01099.032%


ECM Summary

B1B2factorcurvesGHz-days
10.208
500005000000261.694
500006596878141.093
50000660000020716.16
250000400000004720.17


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13Stephen Woodv4_computersB3610BFC2FD776440.101


PRP results:
dateuseridcompidcofactorsres64
2017-10-04Oliver KruseGTX-1
84066344366268239887
4FE1AFC2AFE18C9D
2017-11-07kkmrkkblmbrbkc4.xlarge
84066344366268239887
4FE1AFC2AFE18C9D


CERT results:
No CERT results for M1870067


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
263
261
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
250
260
270
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Last modified: 2024-02-29T14:28:04+00:00