is 2 1755197 - 1
has 528367 decimal digits
takes 0.095 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6946FA717E0D7F35double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.929168.6567%500000150000000.10155.0431%17.030670.2374%1.5807%
PrimeNet2570.010963.1579%80001400000.00122.8040%0.012164.1910%1.0331%
GPU722610.175065.5738%80001100000.00111.4135%0.176166.0604%0.4866%
Difference+6+16.7541+3.0829%+492000+14890000+0.1004+3.6296%+16.8545+4.1770%+4.1770%

Known prime factors (2 factors, 151.5 bits, 0.00863397% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17551974625640549189316007992168.648131769839772667
17 × 211 × 1297 × 28323353
2013-05-2312972832335347.7230.12150.2267
175519789927109547542862702175592582.8952561738356080339207
3 × 2099 × 406818859152031
2020-07-272099406818859152031604,7831,743,5243,256,417

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1755197415970484394503950420343349502191456986822964146151.543
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:44:00Carsten Kossendeyleela950001567500---0.014--2.412%
2016-03-16T12:29:48alpertronManual testing5000001500000012---0.101--5.043%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-22T01:17:00Architects Cubedi4l_1260261--0.088--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.909--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.463 GHz-days
Estimated T-Level:24.536
DigitsB1CurvesCompleteFacMiss
2011000254 / 1002.5407.786%
2550000254 / 2800.90740.302%

New Calculation Method

Total ECM effort:17.463 GHz-days
Estimated T-Level:24.536
DigitsB1CompleteFacMiss
20110008.1940.028%
25500000.74147.686%
302500000.04695.542%
3510000000.00299.791%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000001258.594
5000050000001298.869


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers6946FA717E0D7F350.095
1999-01-10T00:00:00ANONYMOUSv4_computers6946FA717E0D7F350.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T12:05:15Oliver KruseDoppelherz
462564054918931600799
5CD7A8238CCDA9__no
2017-11-03T22:56:15ATHec2-1xf
462564054918931600799
5CD7A8238CCDA9__no
2020-07-27T12:37:00Oliver KruseThreadripper-PC
462564054918931600799
8992710954754286270217559
843ECBE56759C767no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 95000, B2 = 1567500 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
102
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102
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105
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1010
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1015
TF factor-bounds graph:
267
263
261
258
250
260
270
280
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2100
Last modified: 2020-07-27T12:37:00+00:00