is 2 1788539 - 1
has 538404 decimal digits
takes 0.097 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L53BC036F05D700CDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.613568.6567%500000150000000.10155.0546%16.715070.2410%1.5843%
PrimeNet2570.010763.1579%80001400000.00122.8141%0.011964.1947%1.0368%
GPU722610.171765.5738%80001300000.00121.4931%0.172966.0878%0.5140%
Difference+6+16.4418+3.0829%+492000+14870000+0.1003+3.5615%+16.5421+4.1532%+4.1532%

Known prime factors (2 factors, 125.7 bits, 0.00702557% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17885391974488263467929031857.45455198356409
7 × 7885479487
2003-01-25778854794870.012833.79563.120
17885393392045807750383462312168.20194827281030785
5 × 349 × 607 × 89525999
2020-12-016078952599950.0020.38370.7166

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
17885396697554636548723284616601283176759859338125.655
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:34:10alpertronManual testing5000001500000012---0.101--5.055%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers??57.454180.0020.1970.004
2003-08-25T00:00:00ANONYMOUSv4_computers??57.454180.0020.1970.004


ECM factoring results:

Old Calculation Method

Total ECM effort:17.843 GHz-days
Estimated T-Level:24.625
DigitsB1CurvesCompleteFacMiss
2011000259 / 1002.5907.405%
2550000259 / 2800.92539.588%

New Calculation Method

Total ECM effort:17.843 GHz-days
Estimated T-Level:24.625
DigitsB1CompleteFacMiss
20110008.3550.024%
25500000.75546.996%
302500000.04695.457%
3510000000.00299.787%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025817.77
50000500000010.069


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-01T00:00:00Ethan O'Connorv4_computers53BC036F05D700CD0.097


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T20:13:07Oliver KruseDoppelherz
197448826346792903
1E6BEC6AA4291C__no
2017-11-05T04:02:26kkmrkkblmbrbkc4.xlarge
197448826346792903
1E6BEC6AA4291C__no
2020-12-02T04:48:04mrhlanai
197448826346792903
339204580775038346231
D8AE630EA192804Bno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
2
250
260
270
280
290
2100
Last modified: 2020-12-11T12:25:27+00:00