is 2 91338553 - 1
has 27495645 decimal digits
takes 330.849 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
Actual277335.106764.9351 %745000173212508.65633.3496 %343.763066.1096 %
Target27583.775264.0000 %60000011000000034.45684.1375 %118.232065.4895 %
Difference+2+251.3315+0.9351 %+145000-92678750-25.8005-0.7879 %+225.5311+0.6201 %

Known prime factors (1 factor, 79.9 bits, 0.00008752% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
9133855311569094488789878545135772579.9376333083954586996
22 × 3 × 3061 × 32099 × 5371297
2019-05-063209953712972,343.11.69642.8707

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2019-05-06RuzovejManual testing74500017321250422579.9378.6564.062%


Trial Factoring results:
575859606162636465666768697071727374757677
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-12-29Architects Cubedm1_562642650.041
2013-06-12David CampeauManual testing2652660.082
2013-08-29Norman LeyManual testing2662670.164
2014-04-03SMoffatManual testing2672680.327
2014-06-04SMoffatManual testing2682690.655
2014-06-08SMoffatManual testing2692701.309
2015-08-29monstManual testing2702712.618
2017-03-15monstManual testing2712725.236
2018-04-12RichD0Manual testing27227310.47
2018-04-27RichD0Manual testing27327420.94
2018-12-16TheJudgerManual testing274276125.7
2019-03-10TheJudgerManual testing276277167.6


ECM factoring results:
No ECM results for M91338553


Lucas-Lehmer results:
No L-L results for M91338553


PRP results:
No PRP results for M91338553


CERT results:
No CERT results for M91338553


P-1 factor-bounds graph:
B1 = 745000, B2 = 17321250 (P-1 stage 2)
B1 = 745000 (P-1 stage 1)
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106
103
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105
106
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108
TF factor-bounds graph:
277
276
274
273
272
271
270
269
268
267
266
265
this exponent TF target: 75
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00