is 2 1833079 - 1
has 551812 decimal digits
takes 0.099 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L251C2700EB9AD888double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.209868.6567%500000150000000.10155.0696%16.311370.2457%1.5890%
PrimeNet2570.010563.1579%80001500000.00122.8800%0.011764.2190%1.0611%
GPU722610.167665.5738%90001400000.00131.5951%0.168866.1229%0.5491%
Difference+6+16.0423+3.0829%+491000+14860000+0.1002+3.4745%+16.1425+4.1228%+4.1228%

Known prime factors (1 factor, 77.3 bits, 0.00421705% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18330791862790625662103015180632477.30250810429492185089
3 × 16936809830728363
2014-05-0831693680983072836332,12772,586,933135,572,176

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-12T05:42:00Carsten Kossendeyleela1000001675000---0.015--2.492%
2016-03-16T12:39:46alpertronManual testing5000001500000012---0.101--5.070%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-17T14:28:00Architects Cubeda3_lm260261--0.084--
2011-01-21T16:11:00GrunwalderGIMPManual testing21263--0.871--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.453 GHz-days
Estimated T-Level:24.304
DigitsB1CurvesCompleteFacMiss
2011000241 / 1002.4108.873%
2550000241 / 2800.86142.221%

New Calculation Method

Total ECM effort:18.453 GHz-days
Estimated T-Level:24.304
DigitsB1CompleteFacMiss
20110008.2300.027%
25500000.74647.446%
302500000.04695.492%
3510000000.00299.788%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000362.487
50000660000020515.97


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00Dylan Jonesv4_computers251C2700EB9AD8880.099


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T02:20:10Oliver KruseGTX-0
186279062566210301518063
F21F1529136A6A__no
2017-11-06T12:37:54kkmrkkblmbrbkold
186279062566210301518063
F21F1529136A6A__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 100000, B2 = 1675000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-04-30T08:12:17+00:00