is 2 165958589 - 1
has 49958514 decimal digits
takes 1,089.103 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
Actual27311.526061.6438 %1415000141500013.46462.8992 %24.990662.7559 %
Target278368.866264.1026 %1000000180000000102.31593.9152 %471.182165.5080 %
Difference-5-357.3401-2.4587 %+415000-178585000-88.8513-1.0160 %-446.1915-2.7522 %

Known prime factors (1 factor, 80.7 bits, 0.00004863% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16595858919813509657713395145325912580.7135969413748665155
3 × 5 × 2521 × 342553 × 460829
2021-06-273425534608291,475.53.32096.6339

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2021-06-27MadPooManual testing1415000141500012580.71313.461.706%


Trial Factoring results:
57585960616263646566676869707172737475767778
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-07-05Torchwood InstitutePH95002632640.012
2011-02-11MattDell2642650.023
2013-03-19Richard172.26.176.512652660.045
2015-05-26Hagrid MandrakeAkoya2662670.090
2016-05-31kevshawRanger2672680.180
2017-04-17Andrew BManual testing2682690.360
2018-03-24arnaudstylmonde2692700.720
2018-03-24Damian Silvestrecamp12702711.441
2018-03-26yponomarevwork_ora32712722.882
2018-03-26RichardManual testing2722735.764


ECM factoring results:
No ECM results for M165958589


Lucas-Lehmer results:
No L-L results for M165958589


PRP results:
No PRP results for M165958589


CERT results:
No CERT results for M165958589


P-1 factor-bounds graph:
B1 = 1415000 (P-1 stage 1)
104
105
106
107
104
105
106
107
TF factor-bounds graph:
273
272
271
270
269
268
267
266
265
264
this exponent TF target: 78
TF double-checked to: 67
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00