is 2 9128681 - 1
has 2748007 decimal digits
takes 2.523 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
Actual2673.255064.1791%1000000012893923350285.324517.6258%288.579570.4928%6.3137%
PrimeNet2640.389962.5000%4000010000000.03703.4048%0.426963.7768%1.2768%
GPU722686.529464.7059%6000013000000.05112.4053%6.580565.5548%0.8489%
Difference-1-3.2744-0.5268%+9940000+12892623350+285.2734+15.2205%+281.9990+4.9380%+4.9380%

Known prime factors (2 factors, 51.8 bits, 0.00056776% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
912868154772087825.7073
3
-134.900e-134.444e-78.156e-7
912868173029449826.1224
22
2008-09-08449.802e-131.603e-63.262e-6

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
912868139999753341900631651.829
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-07-01T00:18:11Ivan MManual testing10000010000006-
skipped known factor: 54772087
skipped known factor: 73029449
--0.060--2.790%
2022-01-22T06:40:20LordJuliusWhiteBox_v3081000000012893923350-
skipped known factor: 54772087
skipped known factor: 73029449
--285.3--17.626%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-08T05:24:00Will EdgingtonManual testing??26.12288.47917e-165.5141.85320e-15
2019-06-30T23:36:14Ivan MManual testing225250
skipped known factors(?)
--1.64307e-5--
2019-06-30T23:36:14Ivan MManual testing250252--4.92920e-5--
2019-06-30T23:43:56Ivan MManual testing252260--0.017--


ECM factoring results:
No ECM results for M9128681


Lucas-Lehmer results:
No L-L results for M9128681


PRP results:
dateuseridcompidcofactorsres64PRP
2019-06-30T14:45:34Ivan MLAB
54772087
73029449
728D8902C2501A__no
2020-10-22T07:56:00kutensrigel
54772087
73029449
728D8902C2501A45no


P-1 factor-bounds graph:
B1 = 10000000, B2 = 12893923350 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 100000, B2 = 1000000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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2
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2100
Last modified: 2022-01-22T06:40:20+00:00