is 2 14976517 - 1
has 4508381 decimal digits
takes 7.172 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L71CB3A5EE975F9D9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual274255.457667.5676%17000024225000.20331.8181%255.660968.1572%0.5896%
PrimeNet2650.487163.0769%6500020000000.11834.1420%0.605564.6063%1.5294%
GPU722697.971665.2174%10000026000000.16402.9926%8.135666.2583%1.0409%
Difference+5+247.4860+2.3502%+70000-177500+0.0392-1.1745%+247.5253+1.8989%+1.8989%

Known prime factors:
No known factors for M14976517

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-06-09T00:00:00ANONYMOUSv4_computers1700002422500---0.203--1.818%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-08-24T00:00:00Net_Forcev4_computers21257--0.001--
2000-09-08T00:00:00Net_Forcev4_computers21258--0.003--
2000-09-29T00:00:00Net_Forcev4_computers21259--0.005--
2000-12-31T00:00:00ANONYMOUSv4_computers21265--0.487--
2016-03-16T02:28:02Mark RoseManual testing265266--0.499--
2015-10-25T10:22:38NesowaManual testing266267--0.998--
2018-02-05T20:30:48ramgeisManual testing267268--1.996--
2018-02-05T20:30:48ramgeisManual testing268269--3.992--
2021-07-14T06:52:04lycornManual testing269270--7.983--
2021-09-02T18:06:37SRBaseManual testing270271--15.97--
2021-10-16T10:34:33-Anonymous-Manual testing271272--31.93--
2021-12-03T13:20:22-Anonymous-Manual testing272273--63.87--
2022-01-30T13:43:22-Anonymous-Manual testing273274--127.7--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.728 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.728 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.728


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-06-23T00:00:00ANONYMOUSv4_computers71CB3A5EE975F9D97.172
2006-02-01T00:00:00ANONYMOUSv4_computers71CB3A5EE975F9D97.172


PRP results:
No PRP results for M14976517


P-1 factor-bounds graph:
B1 = 170000, B2 = 2422500 (P-1 stage 2)
B1 = 170000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-01-30T13:43:22+00:00