is 2 1838957 - 1
has 553582 decimal digits
takes 0.100 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26716.158068.6567 %500000150000000.10155.0716 %16.259570.2463 %
Target2610.167065.5738 %90007000000.00371.5962 %0.170766.1233 %
Difference+6+15.9910+3.0829 %+491000+14300000+0.0978+3.4754%+16.0888+4.1230 %

Known prime factors (2 factors, 75.9 bits, 0.00412976% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
183895714711657823.8104
22
-446.082e-133.146e-76.404e-7
183895749422982419632171652.1341343777544
23 × 32 × 372 × 13633
2014-07-301369136330.00060.00020.0002

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012
skipped known factor: 14711657
skipped known factor: 4942298241963217
---8.869%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2014-07-30TJAOIManual testing??
52.134
16
0.000


ECM factoring results:
Total ECM effort:41.551 GHz-days
Estimated T-Level:25.723
DigitsB1CompleteFacMiss
201100015.0430.000%
25500001.69818.307%
302500000.14586.534%
3510000000.01099.000%


ECM Summary

B1B2factorcurvesGHz-days
500005000000362.488
50000660000021516.75
250000484681624722.31


Lucas-Lehmer results:
No L-L results for M1838957


PRP results:
dateuseridcompidcofactorsres64
2017-10-04Oliver KruseGTX-1
14711657
4942298241963217
4396784936AD6757
2017-11-06kkmrkkblmbrbkc4.xlarge
14711657
4942298241963217
4396784936AD6757


CERT results:
No CERT results for M1838957


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
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103
104
105
106
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.72 ~= 69-bit
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270
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Last modified: 2024-03-13T02:15:48+00:00