is 2 4999201 - 1
has 1504910 decimal digits
takes 0.693 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L97CB8A4DD467034Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.943765.6716%12000024300000.04943.2588%5.993166.7903%1.1187%
PrimeNet2610.061462.2951%220004500000.00913.3131%0.070663.5443%1.2492%
GPU722651.459464.6154%340007000000.01412.4159%1.473565.4703%0.8549%
Difference+2+4.4844+1.0563%+86000+1730000+0.0353+0.8429%+4.5196+1.3201%+1.3201%

Known prime factors (1 factor, 66.8 bits, 0.00133674% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
49992011308443860592762347912166.82613086529833395
5 × 2617305966679
2014-05-06526173059666793.015628,66053,529

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-20T11:57:00Carsten Kossendeydurandal25000362500---0.009--1.424%
2011-07-10T01:12:00Squeeky_SquirrelT7500_220060000990000---0.022--2.312%
2011-12-09T12:14:00Squeeky_SquirrelT7500_22001200002430000---0.049--3.259%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-02T15:04:00Sturle Sundelara261262--0.061--
2011-08-27T22:57:00GrunwalderGIMPManual testing21263--0.319--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.632 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.632 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000030.632


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-08-10T00:00:00ANONYMOUSv4_computers97CB8A4DD467034C0.693


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T18:08:42kkmrkkblmbrbkManual testing
130844386059276234791
6261DF29BBA336__no
2018-04-24T08:10:23Ducho_YYZLyra
130844386059276234791
6261DF29BBA336__no


P-1 factor-bounds graph:
B1 = 120000, B2 = 2430000 (P-1 stage 2)
B1 = 120000 (P-1 stage 1)
B1 = 60000, B2 = 990000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 25000, B2 = 362500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-04-24T08:10:23+00:00