is 2 4953979 - 1
has 1491297 decimal digits
takes 0.687 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5D6FF3B1167EED8Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.998065.6716%1200000397500000.66337.3632%6.661368.1993%2.5277%
PrimeNet2610.062062.2951%220004500000.00913.3081%0.071163.5424%1.2473%
GPU722651.472764.6154%340007000000.01412.4122%1.486865.4689%0.8536%
Difference+2+4.5253+1.0563%+1166000+39050000+0.6492+4.9509%+5.1745+2.7303%+2.7303%

Known prime factors (1 factor, 80.6 bits, 0.00162633% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
495397917920073991398239687602712580.568180865461797458565
5 × 43 × 841234706034691
2017-05-224384123470603469162,3209,211,75417,204,991

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-29T15:47:00Carsten Kossendeydurandal30000435000---0.010--1.575%
2011-07-23T05:20:00Squeeky_SquirrelT7500_220060000960000---0.022--2.291%
2015-03-08T07:26:00mikrMSI120000039750000---0.663--7.363%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:05Mark RoseManual testing21261--0.062--
2009-12-27T17:27:00markrrmst261262--0.062--
2011-11-06T06:09:00GrunwalderGIMPManual testing21263--0.322--
2016-02-23T16:39:05Mark RoseManual testing262263--0.198--
2015-01-02T13:15:00VictordeHollanderManual testing263264--0.396--
2015-01-02T13:15:00VictordeHollanderManual testing264265--0.754--
2015-07-28T21:32:00snme2pm1Manual testing265266--1.508--
2017-10-26T16:09:15YxinityManual testing266267--3.017--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.682 GHz-days
Estimated T-Level:0.400
DigitsB1CurvesCompleteFacMiss
20110008 / 1000.08092.274%
25500008 / 2800.02997.178%

New Calculation Method

Total ECM effort:1.682 GHz-days
Estimated T-Level:0.400
DigitsB1CompleteFacMiss
20110000.25877.255%
25500000.02397.695%
302500000.00199.856%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.262
50000500000020.421


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-05-23T00:00:00ANONYMOUSv4_computers5D6FF3B1167EED8F0.687
2015-11-13T21:36:50MadPooManual testing5D6FF3B1167EED8F0.687


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T13:08:59alpertronManual testing
1792007399139823968760271
07CD96DA947158__no
2018-01-09T23:24:43kkmrkkblmbrbkc4.xlarge
1792007399139823968760271
07CD96DA947158__no


P-1 factor-bounds graph:
B1 = 1200000, B2 = 39750000 (P-1 stage 2)
B1 = 1200000 (P-1 stage 1)
B1 = 60000, B2 = 960000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 30000, B2 = 435000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-01-09T23:24:43+00:00