is 2 6441563 - 1
has 1939104 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-L03C363164C1FDA86double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2674.612865.6716%350002975000.01341.5330%4.626266.1979%0.5263%
PrimeNet2620.095462.9032%280006500000.01683.4843%0.112264.1958%1.2926%
GPU722662.292765.1515%4500010000000.02642.5753%2.319066.0490%0.8975%
Difference+1+2.3202+0.5201%-10000-702500-0.0130-1.0423%+2.3072+0.1489%+0.1489%

Known prime factors (1 factor, 72.1 bits, 0.00111988% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
644156351948869210857265280172272.138403231864773016
23 × 50403983096627
2011-12-12850403983096627258.90746,3321,393,941

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-02-18T00:00:00ANONYMOUSv4_computers2500025000---0.007--0.463%
2001-10-13T00:00:00ANONYMOUSv4_computers35000297500---0.013--1.533%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-05T00:00:00Kimon Berlinv4_computers21262--0.095--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21T00:00:00ANONYMOUSv4_computers2846D2FA20AF99__1.207
1999-08-16T00:00:00ANONYMOUSv4_computers03C363164C1FDA861.207
2001-10-20T00:00:00ANONYMOUSv4_computers03C363164C1FDA861.207


PRP results:
dateuseridcompidcofactorsres64PRP
2017-12-17T07:34:22Oliver KruseGTX-3
5194886921085726528017
C8C1C0B0C46EA2__no
2018-07-16T20:42:53kkmrkkblmbrbkc5.large
5194886921085726528017
C8C1C0B0C46EA2__no


P-1 factor-bounds graph:
B1 = 35000, B2 = 297500 (P-1 stage 2)
B1 = 35000 (P-1 stage 1)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-07-16T20:42:53+00:00