is 2 268803947 - 1
has 80918051 decimal digits
takes 3,210.714 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2670.110556.7164%----0.110556.7164%0.0000%
PrimeNet27656.933761.8421%10000006500000077.71065.4956%134.644263.9391%2.0970%
GPU72280910.948563.7500%16000006500000087.53614.0651%998.484665.2236%1.4736%
Difference-13-910.8380-7.0336%-1600000-65000000-87.5361-4.0651%-998.3740-8.5072%-8.5072%

Known prime factors (4 factors, 225.0 bits, 0.00008369% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2688039472322466102091237.757432
24 × 33
2008-02-0127277.448e-110.00050.0010
2688039476289552903965550791859.1261169914537
11 × 67 × 191 × 8311
2015-10-2819183110.00040.01100.0147
26880394723082493473305696091961.0024293555532
22 × 7 × 153341269
2016-03-2271533412690.0012144.69270.25
2688039471571791816583475893272167.091292367696629
292367696629
2021-09-0712923676966290.1348275,881515,270

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
2688039471460727341676171284689122015113096.883
2688039475360830864346614546513645382813098.758
2688039473650433213557585478946257763934332104.848
268803947145178563855795713657615408041199411137120.127
2688039479885867784421889176564556912502804183338126.217
26880394736280874347683386078681185365891896314339128.092
26880394733717229330519403195373183355776923842582047919948157.884
2688039472295959281906340937996984626982835281778329687309750163.974
2688039478426110082668130508760726262454370286939075852688750165.849
26880394722819047861188129912433546392767211433595392495377
0453297
57187.218
26880394752996465139578747473906071516965245706941172082921
964811729597909073
68224.975
P-1 results:
No P-1 results for M268803947


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2015-10-28T12:07:08TJAOIManual testing259260*59.126187.27834e-56,5940.000
2022-07-07T04:55:14LordJuliusManual testing26026161.002190.0016,5940.001
2016-03-22T12:38:33TJAOIManual testing261262*61.002192.77034e-56,5945.68994e-5
TF assumed completed to 67 but no detailed record exists
2021-09-07T10:48:52TJAOIManual testing267268*67.091210.0246,5940.050


ECM factoring results:
No ECM results for M268803947


Lucas-Lehmer results:
No L-L results for M268803947


PRP results:
No PRP results for M268803947


P-1 factor-bounds graph:
100
101
102
103
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
268
267
262
261
260
230
240
250
260
270
280
290
2100
Last modified: 2022-07-07T04:55:14+00:00