is 2 131833921 - 1
has 39685965 decimal digits
takes 699.452 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
Actual27314.509563.0137 %13350003637875024.95846.1851 %39.467965.3013 %
Target277232.172264.9351 %80000015000000068.69003.9314 %300.862166.3136 %
Difference-4-217.6627-1.9214 %+535000-113621250-43.7315+2.2536%-261.3942-1.0123 %

Known prime factors (1 factor, 87.4 bits, 0.00006629% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1318339212031094883304174119411294712787.392770323323427577535
3 × 5 × 72 × 11 × 19 × 127 × 8647 × 4566361
2021-04-1286474566361237,7461.97683.5747

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2021-04-12yphysicsManual testing133500036378750622787.39224.964.333%


Trial Factoring results:
575859606162636465666768697071727374757677
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-06-03Mr-Plonklinux-i7-9202632640.015
2010-11-15Torchwood InstituteMVB_Ph2_940_22642650.028
2012-12-05VictordeHollanderManual testing2652680.397
2012-12-05VictordeHollanderManual testing2682690.453
2013-01-23VictordeHollanderManual testing2692700.907
2013-12-02VictordeHollanderManual testing2702711.814
2013-12-02VictordeHollanderManual testing2712723.628
2013-12-02VictordeHollanderManual testing2722737.255


ECM factoring results:
No ECM results for M131833921


Lucas-Lehmer results:
No L-L results for M131833921


PRP results:
No PRP results for M131833921


CERT results:
No CERT results for M131833921


P-1 factor-bounds graph:
B1 = 1335000, B2 = 36378750 (P-1 stage 2)
B1 = 1335000 (P-1 stage 1)
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108
TF factor-bounds graph:
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271
270
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268
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this exponent TF target: 77
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00