is 2 87716843 - 1
has 26405401 decimal digits
takes 295.719 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
Actual276174.470464.4737%705000133950006.82613.4618%181.296565.7035%1.2298%
PrimeNet2715.450261.9718%360000170000006.19165.4016%11.641864.0260%2.0541%
GPU7227587.234264.0000%600000200000008.09994.0444%95.334165.4560%1.4560%
Difference+1+87.2362+0.4737%+105000-6605000-1.2738-0.5827%+85.9624+0.2475%+0.2475%

Known prime factors (1 factor, 89.0 bits, 0.00010142% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
877168436046516836366612591008103532788.9663446611066683403432
23 × 11 × 173 × 491 × 108863 × 4235471
2018-05-151088634235471769,0881.63122.1069

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2018-05-15T14:53:18mikrS052705000133950002788.9666.826591.413.653.462%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2010-11-19T03:20:00Architects Cubedm1_67264265--0.043--
2013-03-05T23:02:00pamatt65-dev-02265266--0.085--
2013-06-22T23:34:00SMoffatManual testing266267--0.170--
2013-12-24T07:13:00Carsten KossendeyManual testing267268--0.341--
2014-01-18T07:21:00Carsten KossendeyManual testing268269--0.682--
2014-03-23T11:13:00Preben SManual testing269270--1.363--
2014-09-07T10:28:00Preben SManual testing270271--2.726--
2017-06-27T14:26:47RichD0Manual testing271273--16.36--
2017-07-13T08:37:06Brian BeuningManual testing273274--21.81--
2018-05-07T16:10:16Strolling JellyfishManual testing274275--43.62--
2018-05-07T16:10:16Strolling JellyfishManual testing275276--87.24--


ECM factoring results:
No ECM results for M87716843


Lucas-Lehmer results:
No L-L results for M87716843


PRP results:
No PRP results for M87716843


P-1 factor-bounds graph:
B1 = 705000, B2 = 13395000 (P-1 stage 2)
B1 = 705000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-05-15T14:53:18+00:00