is 2 64855181 - 1
has 19523355 decimal digits
takes 157.319 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
Actual27458.990964.8649 %----58.990964.8649 %
Target27458.990964.8649 %4500007000000014.91063.8607 %73.901566.2213 %
Difference----450000-70000000-14.9106-3.8607 %-14.9106-1.3565 %

Known prime factors (1 factor, 85.9 bits, 0.00013244% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
64855181720156680614153119988139112685.897555203662614212055
3 × 5 × 232 × 719 × 919 × 4967 × 21319
2013-05-09496721319138,4710.02060.0356

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-05-09kdgehmanManual testing2685.8972.9320.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-10-08Gordon Spencev4_computers212590.001
2004-02-14AxelFoxv4_computers212600.001
2022-03-30LordJuliusManual testing260263
2009-03-12CPSlackerbf-st-2k3-64-2p2632650.088
2009-05-25BoulderManual testing2652660.115
2009-10-05ANONYMOUSFranki2662670.230
2009-10-16Vincent Richard012672680.461
2009-10-18Sturle Sundefizir.ifi2682690.922
2012-01-16wurkfurCobb_Internet_NT2692701.844
2012-07-02wangyun183Manual testing2702713.687
2012-12-27kdgehmanManual testing2712727.374
2013-05-02kdgehmanManual testing27227314.75
2013-05-05kdgehmanManual testing27327429.50


ECM factoring results:
No ECM results for M64855181


Lucas-Lehmer results:
No L-L results for M64855181


PRP results:
No PRP results for M64855181


CERT results:
No CERT results for M64855181


P-1 factor-bounds graph:
102
103
104
102
103
104
105
TF factor-bounds graph:
274
273
272
271
270
269
268
267
266
265
263
260
259
this exponent TF target: 74
TF double-checked to: 67
250
260
270
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290
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Last modified: 2024-03-13T02:15:48+00:00