is 2 71540561 - 1
has 21535855 decimal digits
takes 191.272 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
Actual27453.478363.5135 %660000140250005.38154.1040 %58.859865.0109 %
Target27453.478363.5135 %5000008000000018.73004.0672 %72.208364.9975 %
Difference---+160000-65975000-13.3484+0.0368%-13.3484+0.0134 %

Known prime factors (1 factor, 105.1 bits, 0.00014696% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
715405614468096821001850388095003778148732105.139312277172456185407051463
412 × 53 × 4021 × 4481 × 49201 × 3953791
2015-03-084920139537911.966e+91.01541.5597

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2015-03-08TheJudgerManual testing6600001402500012232105.1395.6754.104%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-10-19Wojciech FlorekManual testing212640.026
2010-04-28lindeeLKPNNY92642650.052
2010-04-28ANONYMOUS_2652660.104
2010-05-04ANONYMOUS2662670.209
2010-09-18GrunwalderGIMPcompute-0-22672680.418
2010-09-20GrunwalderGIMPcompute-0-22682690.836
2012-05-09ITSMartinThree2692701.671
2014-05-04HBendtzManual testing2702713.343
2014-12-29RichD0Manual testing2712726.685
2015-02-15Matthias WurtingerManual testing27227313.37
2015-02-26chalsallManual testing27327426.74


ECM factoring results:
No ECM results for M71540561


Lucas-Lehmer results:
No L-L results for M71540561


PRP results:
No PRP results for M71540561


CERT results:
No CERT results for M71540561


P-1 factor-bounds graph:
B1 = 660000, B2 = 14025000 (P-1 stage 2)
B1 = 660000 (P-1 stage 1)
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104
105
106
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104
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108
TF factor-bounds graph:
274
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271
270
269
268
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265
264
this exponent TF target: 74
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00