is 2 8420983 - 1
has 2534969 decimal digits
takes 2.199 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L111E885AFADF9CC4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2673.528664.1791%10000018250000.07343.1941%3.602065.3233%1.1441%
PrimeNet2640.422762.5000%340009000000.03073.1757%0.453463.6909%1.1909%
GPU722687.078164.7059%5000011000000.04062.1889%7.118765.4785%0.7726%
Difference-1-3.5496-0.5268%+50000+725000+0.0329+1.0051%-3.5167-0.1552%-0.1552%

Known prime factors (1 factor, 67.6 bits, 0.00080282% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
84209832245108346985883113592167.60513330441036313
1193 × 11173881841
2013-06-121193111738818415.9664230.49430.50

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-10-19T00:00:00ANONYMOUSv4_computers35000192500---0.017--1.396%
2012-06-16T12:52:00bcp19Toshiba-740Q1000001825000---0.073--3.194%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-09-20T00:00:00ANONYMOUSv4_computers21261--0.036--
1998-10-04T00:00:00ANONYMOUSv4_computers21262--0.073--
1999-02-14T00:00:00MK-mauiv4_computers21263--0.190--
1999-10-21T00:00:00ANONYMOUSv4_computers21264--0.423--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-02-01T00:00:00ANONYMOUSv4_computers111E885AFADF9CC42.199
2002-10-26T00:00:00ANONYMOUSv4_computers111E885AFADF9CC42.199


PRP results:
dateuseridcompidcofactorsres64PRP
2018-10-30T00:49:29Oliver KruseGTX-4
224510834698588311359
678E8B17AFD80F__no
2020-05-26T15:30:15Luigi Morelli9800X
224510834698588311359
678E8B17AFD80F11no


P-1 factor-bounds graph:
B1 = 100000, B2 = 1825000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 35000, B2 = 192500 (P-1 stage 2)
B1 = 35000 (P-1 stage 1)
102
103
104
105
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
264
263
262
261
250
260
270
280
290
2100
Last modified: 2020-05-26T15:30:15+00:00