is 2 6439493 - 1
has 1938481 decimal digits
takes 1.207 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6315795D996A1AD9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272148.510768.0556%700000150000000.40203.7885%148.912769.2658%1.2102%
PrimeNet2620.095462.9032%280006500000.01683.4841%0.112264.1957%1.2925%
GPU722662.293465.1515%4500010000000.02642.5752%2.319866.0489%0.8974%
Difference+6+146.2173+2.9040%+655000+14000000+0.3756+1.2133%+146.5929+3.2168%+3.2168%

Known prime factors:
No known factors for M6439493

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-02-18T00:00:00ANONYMOUSv4_computers2500025000---0.007--0.197%
2011-08-31T08:03:00markrtiny1650003630000---0.096--2.219%
2020-04-09T21:45:59takahashivaio7000001500000012---0.402--3.788%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-11T00:00:00ANONYMOUSv4_computers21262--0.095--
2016-02-23T16:39:24Mark RoseManual testing262263--0.152--
2014-08-02T07:16:00NesowaManual testing263264--0.305--
2014-08-05T06:50:00lycornManual testing264265--0.580--
2015-10-24T21:43:21snme2pm1Manual testing265266--1.160--
2016-04-03T19:18:39Gordon SpenceManual testing266267--2.321--
2018-06-06T15:03:39ramgeisManual testing267268--4.642--
2020-05-17T05:08:13takahashiManual testing268269--9.284--
2021-03-02T12:26:34takahashiManual testing269270--18.57--
2021-08-10T15:29:50SRBaseManual testing270271--37.13--
2021-09-25T07:08:38SRBaseManual testing271272--74.27--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.710 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:1.710 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.710


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00ANONYMOUSv4_computers6315795D996A1AD91.207
2002-01-08T00:00:00ANONYMOUSv4_computers6315795D996A1AD91.207


PRP results:
No PRP results for M6439493


P-1 factor-bounds graph:
B1 = 700000, B2 = 15000000 (P-1 stage 2)
B1 = 700000 (P-1 stage 1)
B1 = 165000, B2 = 3630000 (P-1 stage 2)
B1 = 165000 (P-1 stage 1)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-09-25T07:08:38+00:00