is 2 71918663 - 1
has 21649675 decimal digits
takes 192.283 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
Actual275106.396764.0000 %6200006200002.40361.4932 %108.800364.5375 %
Target27453.197163.5135 %5000008500000019.78614.1170 %72.983265.0156 %
Difference+1+53.1996+0.4865 %+120000-84380000-17.3825-2.6238 %+35.8171-0.4781 %

Known prime factors (1 factor, 93.5 bits, 0.00012996% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
71918663136716293965494795406352042332993.46595049246094504562332
22 × 9491 × 58189 × 105401 × 408217
2015-05-3110540140821730,741,4640.47260.8316

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2015-05-31TheJudgerManual testing62000062000012993.4652.5351.677%


Trial Factoring results:
57585960616263646566676869707172737475
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2002-05-11Jossv4_computers212570.000
2008-10-03ANONYMOUSManual testing212640.026
2010-05-05xtuhksa-ms2642650.052
2010-05-09Tom Duellv4_computers212703.221
2010-07-20Tom Duellv4_computers212701.662
2013-04-13Charles A. Morrischandra2702713.325
2015-02-10RichD0Manual testing2712726.650
2015-05-17ixfd64Manual testing27227313.30
2015-05-27ktonyManual testing27327579.80


ECM factoring results:
No ECM results for M71918663


Lucas-Lehmer results:
No L-L results for M71918663


PRP results:
No PRP results for M71918663


CERT results:
No CERT results for M71918663


P-1 factor-bounds graph:
B1 = 620000 (P-1 stage 1)
104
105
106
104
105
106
TF factor-bounds graph:
275
273
272
271
270
265
264
257
this exponent TF target: 74
TF double-checked to: 67
250
260
270
280
290
2100
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Last modified: 2024-03-13T02:15:48+00:00