is 2 91221751 - 1
has 27460484 decimal digits
takes 330.425 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L6DAA5D9B94C590__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual277335.535864.9351 %700000131250007.23203.1368 %342.767966.0350 %
Target27583.882564.0000 %60000011000000034.45684.1368 %118.339365.4893 %
Difference+2+251.6533+0.9351 %+100000-96875000-27.2247-1.0001 %+224.4286+0.5457 %

Known prime factors:
No known factors for M91221751

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2019-04-21BattlemaxxWork-4700000131250006--7.2323.814%


Trial Factoring results:
575859606162636465666768697071727374757677
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-12-29Architects Cubedm1_tt2642650.041
2013-03-24AxelssonManual testing2652660.082
2014-04-05SMoffatManual testing2662670.164
2014-04-05hkskypManual testing2672702.294
2014-09-18ANONYMOUS2702712.621
2017-03-02monstManual testing2712725.243
2018-02-17RichD0Manual testing27227310.49
2018-02-20gcardonaManual testing27327420.97
2018-12-16TheJudgerManual testing274276125.8
2019-03-03TheJudgerManual testing276277167.8


ECM factoring results:
No ECM results for M91221751


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2019-09-08yokoem026DAA5D9B94C590__330.4


PRP results:
No PRP results for M91221751


CERT results:
No CERT results for M91221751


P-1 factor-bounds graph:
B1 = 700000, B2 = 13125000 (P-1 stage 2)
B1 = 700000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
277
276
274
273
272
271
270
267
266
265
this exponent TF target: 75
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00