is 2 1805963 - 1
has 543650 decimal digits
takes 0.098 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4300D7BF07637621double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.453268.6567%500000150000000.10155.0605%16.554770.2428%1.5861%
PrimeNet2570.010663.1579%80001500000.00122.8719%0.011964.2160%1.0581%
GPU722610.170165.5738%90001300000.00121.5554%0.171366.1092%0.5355%
Difference+6+16.2831+3.0829%+491000+14870000+0.1002+3.5051%+16.3834+4.1336%+4.1336%

Known prime factors (1 factor, 72.7 bits, 0.00402510% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
180596376276455974971654541032272.6922111794537733377
7 × 320741 × 940587371
2013-07-14320741940587371939.614.05507.5290

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers25000387500---0.004--1.199%
2011-02-10T11:16:00Carsten Kossendeyleela1000001650000---0.015--2.477%
2016-03-16T12:36:24alpertronManual testing5000001500000012---0.101--5.061%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-11T14:32:00Architects CubedManual testing260261--0.085--
2010-12-13T03:33:00GrunwalderGIMPManual testing21263--0.884--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.438 GHz-days
Estimated T-Level:24.571
DigitsB1CurvesCompleteFacMiss
2011000256 / 1002.5607.631%
2550000256 / 2800.91440.015%

New Calculation Method

Total ECM effort:19.438 GHz-days
Estimated T-Level:24.571
DigitsB1CompleteFacMiss
20110008.7410.016%
25500000.79245.302%
302500000.04995.220%
3510000000.00299.775%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000392.690
50000650000021716.75


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers4300D7BF076376210.098
2000-01-19T00:00:00ANONYMOUSv4_computers4300D7BF076376210.098


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T19:53:31Oliver KruseGTX-0
7627645597497165454103
37C3D2C4B6A1C3__no
2017-11-05T14:43:44ATHec2-1xf
7627645597497165454103
37C3D2C4B6A1C3__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 100000, B2 = 1650000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 25000, B2 = 387500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
Last modified: 2021-02-19T17:12:12+00:00