is 2 17241661 - 1
has 5190258 decimal digits
takes 9.818 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L460F4D1F84062960double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2671.723462.6866%21000040425000.34584.6675%2.069264.4282%1.7416%
PrimeNet2650.423161.5385%8000024000000.17044.5391%0.593663.2843%1.7458%
GPU722696.924363.7681%12000032000000.23763.3019%7.162064.9645%1.1964%
Difference-2-5.2009-1.0815%+90000+842500+0.1082+1.3655%-5.0928-0.5363%-0.5363%

Known prime factors (1 factor, 72.3 bits, 0.00041945% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1724166158930657457504181548472272.320170896114526043
3 × 17 × 3350904206393
2017-12-2317335090420639392.247150,744281,548

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2100004042500---0.346--4.667%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-02-18T00:00:00Net_Forcev4_computers21258--0.002--
2001-04-01T00:00:00Net_Forcev4_computers21259--0.004--
2001-10-13T00:00:00ebravickv4_computers21265--0.423--
2014-03-07T05:08:00NesowaManual testing265266--0.433--
2014-09-05T00:07:00NesowaManual testing266267--0.867--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.866 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.866 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.866


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2003-06-01T00:00:00ANONYMOUSv4_computers460F4D1F840629609.82
2006-05-29T00:00:00Team Prime Ribv4_computers460F4D1F840629609.82


PRP results:
No PRP results for M17241661


P-1 factor-bounds graph:
B1 = 210000, B2 = 4042500 (P-1 stage 2)
B1 = 210000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2017-12-23T09:37:25+00:00