is 2 2079719 - 1
has 626058 decimal digits
takes 0.137 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LAA62A93BD4C799EFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.287568.6567%500000150000000.12305.1472%14.410570.2700%1.6133%
PrimeNet2580.018563.7931%90001600000.00162.6729%0.020164.7609%0.9678%
GPU722620.295466.1290%90001300000.00151.3677%0.296966.5923%0.4633%
Difference+5+13.9921+2.5277%+491000+14870000+0.1215+3.7795%+14.1136+3.6777%+3.6777%

Known prime factors (1 factor, 62.0 bits, 0.00298140% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
207971946271884740589812231962.0051112455210069
7 × 158922172867
2009-11-0271589221728670.3004825.481,541.8

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-27T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.276%
2009-07-25T16:47:00harleeP4_260020000260000---0.003--1.018%
2016-03-16T13:44:52alpertronManual testing5000001500000012---0.123--5.147%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-10T00:00:00Peter Yuv4_computers21258--0.018--
2022-03-09T08:46:53LordJuliusManual testing21260--0.074--
2009-01-03T06:23:00Sturle Sundeinteravia.ifi260261--0.074--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.138 GHz-days
Estimated T-Level:1.550
DigitsB1CurvesCompleteFacMiss
201100031 / 1000.31073.230%
255000031 / 2800.11189.502%

New Calculation Method

Total ECM effort:3.138 GHz-days
Estimated T-Level:1.550
DigitsB1CompleteFacMiss
20110001.26828.148%
25500000.11788.999%
302500000.00799.270%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000070.355
500005000000171.445
50000631882570.659
50000674457770.679


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07T00:00:00Peter Yuv4_computersAA62A93BD4C799EF0.137


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-06T16:16:15Oliver KruseGTX-0
4627188474058981223
F629EF301A9134__no
2017-11-16T13:14:02kkmrkkblmbrbkc4.xlarge
4627188474058981223
F629EF301A9134__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 20000, B2 = 260000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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258
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2100
Last modified: 2022-07-13T17:30:27+00:00