is 2 64774121 - 1
has 19498954 decimal digits
takes 157.122 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
Actual27459.064764.8649 %----59.064764.8649 %
Target27459.064764.8649 %4500007000000014.91063.8601 %73.975366.2211 %
Difference----450000-70000000-14.9106-3.8601 %-14.9106-1.3562 %

Known prime factors (1 factor, 81.9 bits, 0.00012642% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6477412144824832314006854633025212581.89134600880430324060
22 × 3 × 5 × 31 × 587 × 5039 × 6289147
2013-12-115039628914712,8631.22192.2510

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-12-11LaurVR720_22581.8914.1240.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-09-29Gordon Spencev4_computers212590.001
2004-02-07AxelFoxv4_computers212600.001
2022-03-30LordJuliusManual testing260263
2009-06-02markroldgamer2632640.030
2009-10-13kompaksekhmet2642650.058
2009-10-15Sturle Sundegorro.ifi2652660.115
2009-12-21steinrarjb2662670.231
2009-12-24ANONYMOUS2672680.461
2009-12-30Per Jessenbeaufort12682690.923
2012-02-03ANONYMOUS2692701.846
2012-06-30trifdale2702713.692
2013-11-11AllRandomManual testing2712727.383
2013-12-07electron1897Manual testing27227314.77
2013-12-09LaurVManual testing27327429.53


ECM factoring results:
No ECM results for M64774121


Lucas-Lehmer results:
No L-L results for M64774121


PRP results:
No PRP results for M64774121


CERT results:
No CERT results for M64774121


P-1 factor-bounds graph:
102
103
104
102
103
104
105
106
107
TF factor-bounds graph:
274
273
272
271
270
269
268
267
266
265
264
263
260
259
this exponent TF target: 74
TF double-checked to: 67
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00