is 2 3837371 - 1
has 1155164 decimal digits
takes 0.403 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
Actual26815.532767.6471 %5000001303648501.15377.1252 %16.686469.9523 %
Target2640.927565.6250 %2400025000000.02422.2270 %0.951766.3905 %
Difference+4+14.6052+2.0221 %+476000+127864850+1.1295+4.8981%+15.7347+3.5617 %

Known prime factors (2 factors, 109.1 bits, 0.00284229% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
38373717674743722.8721
1
-111.456e-131.523e-73.099e-7
3837371887327703621585232015060492686.19811561661663956719744
27 × 11 × 132 × 23 × 853 × 14479 × 171047
2019-06-28144791710476,845,4080.00350.0045

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2019-06-28JossManual testing20000020000012686.1980.0302.155%
2022-05-17JossManual testing500000130364850
skipped known factor: 7674743
skipped known factor: 88732770362158523201506049
--1.37010.095%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2022-02-13JossManual testing267268


ECM factoring results:
Total ECM effort:0.451 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.451


Lucas-Lehmer results:
No L-L results for M3837371


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
7674743
7DDB8DDB9384B102
2017-12-18Oliver KruseGTX-3
7674743
7DDB8DDB9384B102
2019-06-28ATHec2-PRPCF
7674743
88732770362158523201506049
C22F671703D54435
2019-06-29kkmrkkblmbrbkc5.large
7674743
88732770362158523201506049
C22F671703D54435


CERT results:
No CERT results for M3837371


P-1 factor-bounds graph:
B1 = 500000, B2 = 130364850 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
268
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00