is 2 1555193 - 1
has 468160 decimal digits
takes 0.069 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LB25AA9D16DE7977Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26719.106368.6567 %500000150000000.08354.9700 %19.189870.2145 %
Target2610.197565.5738 %65003000000.00151.0497 %0.199065.9351 %
Difference+6+18.9087+3.0829 %+493500+14700000+0.0821+3.9203%+18.9908+4.2793 %

Known prime factors (1 factor, 65.6 bits, 0.00421854% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1555193561702957338582201772065.60618058946939016
23 × 3 × 59 × 1231 × 10360271
2013-09-301231103602714.69120.03660.0683

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-29Team Prime Ribv4_computers20000290000--0.0022.371%
2011-01-27James HeinrichWHS8000013600006--0.0104.478%
2016-03-17alpertronManual testing5000001500000012
skipped known factor: 56170295733858220177
---8.710%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-10-25ANONYMOUSv4_computers212570.012
2003-08-08ANONYMOUSv4_computers212580.025
2010-05-03Architects Cubeda3_bu22602610.099
2010-06-02GrunwalderGIMPManual testing212631.026


ECM factoring results:
Total ECM effort:31.138 GHz-days
Estimated T-Level:25.715
DigitsB1CompleteFacMiss
201100014.5380.000%
25500001.66418.942%
302500000.14386.682%
3510000000.01099.008%


ECM Summary

B1B2factorcurvesGHz-days
10.168
50000500000024813.74
250000400000005017.23


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-07ANONYMOUSv4_computersB25AA9D16DE7977C0.069


PRP results:
dateuseridcompidcofactorsres64
2017-10-01Oliver KruseGTX-1
56170295733858220177
3B1210BF594FC729
2017-10-30kkmrkkblmbrbkc4.xlarge
56170295733858220177
3B1210BF594FC729


CERT results:
No CERT results for M1555193


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 80000, B2 = 1360000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 20000, B2 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
263
261
258
257
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