is 2 89218477 - 1
has 26857438 decimal digits
takes 300.782 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
Actual276171.533964.4737 %725000141375007.11633.5200 %178.650265.7242 %
Target27585.766064.0000 %60000010000000029.40654.0528 %115.172465.4590 %
Difference+1+85.7679+0.4737 %+125000-85862500-22.2902-0.5328 %+63.4777+0.2652 %

Known prime factors (1 factor, 92.0 bits, 0.00010315% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
8921847750634545319587924222840334312892.03228376714679621758295
3 × 5 × 1399 × 30293 × 46099 × 968321
2018-10-304609996832112,738,2460.47100.4817

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2018-10-30ynagata.orgMAGI-172500014137500622892.0327.1163.878%


Trial Factoring results:
5758596061626364656667686970717273747576
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-11-08Architects Cubedm1_452642650.042
2013-03-16ANONYMOUS2652660.084
2013-03-24SMoffatManual testing2662670.168
2013-04-08SMoffatManual testing2672680.335
2013-07-24SMoffatManual testing2682690.670
2013-07-27SMoffatManual testing2692701.340
2013-09-22SMoffatManual testing2702712.680
2017-07-07monstManual testing2712725.361
2017-08-18Matthias WurtingerManual testing27227310.72
2017-08-23Tim SorberaManual testing27327421.44
2018-09-30TheJudgerManual testing274276128.7


ECM factoring results:
No ECM results for M89218477


Lucas-Lehmer results:
No L-L results for M89218477


PRP results:
No PRP results for M89218477


CERT results:
No CERT results for M89218477


P-1 factor-bounds graph:
B1 = 725000, B2 = 14137500 (P-1 stage 2)
B1 = 725000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
276
274
273
272
271
270
269
268
267
266
265
this exponent TF target: 75
TF double-checked to: 67
250
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2100
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Last modified: 2024-03-13T02:15:48+00:00