is 2 1875997 - 1
has 564732 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L8A0F9C8C21F574DDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26715.839068.6567 %500000150000000.10155.0838 %15.940570.2501 %
Target2610.163765.5738 %100007500000.00401.6907 %0.167766.1558 %
Difference+6+15.6753+3.0829 %+490000+14250000+0.0975+3.3930%+15.7728+4.0943 %

Known prime factors (1 factor, 73.6 bits, 0.00392121% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1875997139409839786280376386472373.5623715620008621559
3 × 1238540002873853
2013-10-07312385400028738531,019.65,308,0739,914,002

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-01-12markrtiny275000600000012--0.0467.184%
2016-03-16alpertronManual testing5000001500000012---8.888%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-09ANONYMOUSv4_computers212580.020
2010-04-10Architects CubedManual testing2602610.082
2011-03-08GrunwalderGIMPManual testing212630.851


ECM factoring results:
Total ECM effort:39.310 GHz-days
Estimated T-Level:25.709
DigitsB1CompleteFacMiss
201100014.9270.000%
25500001.67618.714%
302500000.14286.781%
3510000000.01099.031%


ECM Summary

B1B2factorcurvesGHz-days
10.139
500005000000261.694
500006005350141.048
50000660000020816.25
250000400000004720.18


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-01nysvv4_computers8A0F9C8C21F574DD0.102
1999-05-02nysvv4_computers8A0F9C8C21F574DD0.102
1999-06-06nysvv4_computers8A0F9C8C21F574DD0.102


PRP results:
dateuseridcompidcofactorsres64
2017-10-04Oliver KruseGTX-2
13940983978628037638647
120C2AFD9F019B73
2017-11-08Chang Chia-Tcheex01
13940983978628037638647
120C2AFD9F019B73


CERT results:
No CERT results for M1875997


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)
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TF factor-bounds graph:
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this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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Last modified: 2024-02-29T14:28:04+00:00