is 2 1908769 - 1
has 574597 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-L7A4F3BB2ED81EE97double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26715.567168.6567 %1000000300000000.20296.2210 %15.770070.6066 %
Target2610.160965.5738 %100008500000.00441.7595 %0.165366.1795 %
Difference+6+15.4061+3.0829 %+990000+29150000+0.1986+4.4615%+15.6047+4.4271 %

Known prime factors (1 factor, 80.5 bits, 0.00421996% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
190876917691405716737008930453192580.549463424482395119811
3 × 29 × 53 × 100504116763201
2014-10-0153100504116763201128,285430,736804,494

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-06-13kurlykurlytop10000003000000012--0.20310.439%
2016-03-16alpertronManual testing5000001500000012---8.905%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2011-04-14GrunwalderGIMPv4_computers212560.005
2011-04-14GrunwalderGIMPv4_computers2562570.005
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
2011-03-03GrunwalderGIMPGWPrime022612620.161
2011-03-03GrunwalderGIMPGWPrime022622630.514


ECM factoring results:
Total ECM effort:39.133 GHz-days
Estimated T-Level:25.702
DigitsB1CompleteFacMiss
201100015.0740.000%
25500001.67618.707%
302500000.14086.909%
3510000000.01099.051%


ECM Summary

B1B2factorcurvesGHz-days
10.069
500005000000291.905
50000660000021316.68
500006750000141.108
250000400000004519.37


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27ANONYMOUSv4_computers7A4F3BB2ED81EE970.104


PRP results:
dateuseridcompidcofactorsres64
2017-10-04Oliver KruseGTX-1
1769140571673700893045319
F185C827C5FA22E0
2017-11-09ATHec2-1xh
1769140571673700893045319
F185C827C5FA22E0


CERT results:
No CERT results for M1908769


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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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