is 2 78906647 - 1
has 23753268 decimal digits
takes 246.227 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
Actual27324.241963.0137 %750000168750007.36864.8003 %31.610564.7892 %
Target27596.974264.0000 %5000008500000023.09323.7763 %120.067465.3595 %
Difference-2-72.7323-0.9863 %+250000-68125000-15.7245+1.0240%-88.4568-0.5703 %

Known prime factors (1 factor, 82.6 bits, 0.00010472% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
7890664774859986061397439834602012582.63047435792108488300
22 × 52 × 11 × 31 × 195277 × 7123619
2016-07-10195277712361921,8702.59153.2799

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-07-10Judge Hale6700k750000168750001222582.6307.6063.973%


Trial Factoring results:
57585960616263646566676869707172737475
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-06-17Jossv4_computers212570.000
2003-06-17Jossv4_computers212600.001
2005-02-12ramgeisv4_computers212610.002
2008-06-131997rj7v4_computers212640.025
2011-01-13ANONYMOUS2642650.047
2011-05-12Carsten KossendeyManual testing2652670.284
2012-04-02E.LechnerAMD81502672680.379
2013-03-15ANONYMOUS2682690.758
2013-03-20kevshawhelix2692701.515
2013-06-03PascalBieriManual testing2702713.031
2016-02-12Judge HaleManual testing2712726.061
2016-07-02Matthias WurtingerManual testing27227312.12


ECM factoring results:
No ECM results for M78906647


Lucas-Lehmer results:
No L-L results for M78906647


PRP results:
No PRP results for M78906647


CERT results:
No CERT results for M78906647


P-1 factor-bounds graph:
B1 = 750000, B2 = 16875000 (P-1 stage 2)
B1 = 750000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 75
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00