is 2 1928207 - 1
has 580449 decimal digits
takes 0.105 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5C712485B8EC2407double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.410168.6567%500000150000000.10155.1006%15.511670.2554%1.5987%
PrimeNet2570.010063.1579%90001700000.00143.0953%0.011464.2983%1.1404%
GPU722610.159365.5738%110001700000.00151.8145%0.160966.1984%0.6247%
Difference+6+15.2508+3.0829%+489000+14830000+0.0999+3.2861%+15.3507+4.0570%+4.0570%

Known prime factors (2 factors, 158.1 bits, 0.00819772% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19282071525965309797792803171512477.01439569540765016225
3 × 52 × 13327 × 39588345229
2022-02-17133273958834522922,626169.67316.89
192820725116801808000802689267192581.055651299414637557137
651299414637557137
2016-03-101651299414637557137384,6592.791e+95.213e+9

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
192820738327368252075707269083849453722337195269785756948158.069
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-05-11T00:00:00ANONYMOUSv4_computers3000009000000---0.061--4.332%
2015-10-08T07:30:07Bruno Victal5820K-linux5000001500000012---0.101--5.101%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2002-12-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:58Mark RoseManual testing258260--0.060--
2010-02-09T00:19:00S485122USB-W260261--0.080--
2016-02-23T16:28:58Mark RoseManual testing261262--0.159--
2011-08-27T22:21:00GrunwalderGIMPManual testing21263--0.828--
2016-02-23T16:28:58Mark RoseManual testing262263--0.509--
2015-05-17T23:04:00snme2pm1Manual testing263264--1.018--
2015-05-17T23:04:00snme2pm1Manual testing264265--1.938--
2015-09-03T11:06:00ramgeisManual testing265266--3.875--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.900 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:19.900 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
20110008.8040.015%
25500000.79745.050%
302500000.04995.186%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000281.946
50000500000020.139
50000660000016813.17
500006600000453.529
50000675000070.555
50000685661370.559


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00ANONYMOUSv4_computers5C712485B8EC24070.105
2015-07-01T17:35:00MadPooManual testing5C712485B8EC24070.105


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T00:26:08Oliver KruseGTX-2
2511680180800080268926719
FE488C0224CC4E__no
2017-11-10T17:39:13kkmrkkblmbrbkold
2511680180800080268926719
FE488C0224CC4E__no
2022-02-22T07:37:26LordJuliusWhiteBox
152596530979779280317151
2511680180800080268926719
DD7025A51AB2FC7Fno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 300000, B2 = 9000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-02-22T07:37:26+00:00