is 2 1909087 - 1
has 574693 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L291DA4A60E05ACC2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26715.564568.6567 %1000000300000000.20296.2211 %15.767470.6066 %
Target2610.160965.5738 %100008500000.00441.7595 %0.165366.1795 %
Difference+6+15.4036+3.0829 %+990000+29150000+0.1986+4.4616%+15.6021+4.4271 %

Known prime factors (1 factor, 72.9 bits, 0.00381656% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
190908785798269097360699877932272.8612247102125187608
23 × 13 × 21606751203727
2015-08-041321606751203727500.9492,601172,953

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-06-05kurlykurlytop10000003000000012--0.20310.440%
2016-03-16alpertronManual testing5000001500000012---8.905%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2011-04-14GrunwalderGIMPv4_computers212560.005
2011-04-14GrunwalderGIMPv4_computers2562570.005
2003-01-09ANONYMOUSv4_computers212580.020
2011-04-14GrunwalderGIMPv4_computers2572580.010
2011-04-14GrunwalderGIMPv4_computers2582590.020
2011-04-14GrunwalderGIMPv4_computers2592600.040
2009-05-27Architects Cubedi4l_12602610.080
2011-04-14GrunwalderGIMPv4_computers2602610.080
2011-03-04GrunwalderGIMPGWPrime022612620.161
2011-03-04GrunwalderGIMPGWPrime022622630.514
2015-05-18omylistManual testing2632641.028
2015-05-19monstManual testing2642651.957


ECM factoring results:
Total ECM effort:39.094 GHz-days
Estimated T-Level:25.699
DigitsB1CompleteFacMiss
201100015.0000.000%
25500001.67018.834%
302500000.14086.948%
3510000000.01099.053%


ECM Summary

B1B2factorcurvesGHz-days
10.208
500005000000392.600
50000660000021616.91
250000400000004519.37


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26ANONYMOUSv4_computers291DA4A60E05ACC20.104
2015-07-14MadPooManual testing291DA4A60E05ACC20.104


PRP results:
dateuseridcompidcofactorsres64
2017-09-30alpertronManual testing
8579826909736069987793
3952C150A4D08EDA
2017-10-19Oliver KruseGTX-2
8579826909736069987793
3952C150A4D08EDA


CERT results:
No CERT results for M1909087


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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261
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256
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.7 ~= 69-bit
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Last modified: 2024-02-29T14:28:04+00:00