is 2 17038321 - 1
has 5129046 decimal digits
takes 9.702 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L80B35088A0A40AF9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2697.007063.7681%22000055000000.41924.0597%7.426165.2390%1.4709%
PrimeNet2650.428261.5385%8000024000000.17044.5316%0.598663.2814%1.7429%
GPU722697.007063.7681%12000032000000.23763.2964%7.244664.9624%1.1943%
Difference---+100000+2300000+0.1815+0.7634%+0.1815+0.2766%+0.2766%

Known prime factors (1 factor, 70.3 bits, 0.00041271% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1703832114727195562733846889612270.31943217860382880
25 × 3 × 5 × 31 × 41 × 70839661
2017-10-29417083966119.4923.18685.9521

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-11-16T00:00:00ANONYMOUSv4_computers2200005500000---0.419--4.060%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-02-04T00:00:00Net_Forcev4_computers21258--0.002--
2001-03-05T00:00:00Net_Forcev4_computers21259--0.005--
2001-08-04T00:00:00Hatchv4_computers21265--0.428--
2016-03-17T13:00:23Mark RoseManual testing265266--0.439--
2014-09-15T13:05:00NesowaManual testing266267--0.877--
2015-12-14T18:35:07mikrManual testing267268--1.754--
2017-10-22T21:37:21ramgeisManual testing268269--3.509--


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)
2003-08-25T00:00:00ANONYMOUSv4_computers80B35088A0A40AF99.70
2006-08-25T00:00:00TheJudgerv4_computers80B35088A0A40AF99.70


PRP results:
No PRP results for M17038321


P-1 factor-bounds graph:
B1 = 220000, B2 = 5500000 (P-1 stage 2)
B1 = 220000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2017-10-30T00:54:15+00:00