is 2 8641807 - 1
has 2601444 decimal digits
takes 2.256 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBFEA91459A1F4E0Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2673.438464.1791%10000018250000.07343.2062%3.511865.3276%1.1485%
PrimeNet2640.411962.5000%3600010000000.03353.3054%0.445463.7395%1.2395%
GPU722686.897364.7059%5500012000000.04442.2945%6.941765.5157%0.8098%
Difference-1-3.4589-0.5268%+45000+625000+0.0290+0.9117%-3.4299-0.1881%+0.3387%

Known prime factors (1 factor, 80.0 bits, 0.00092548% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
864180711907421144363936081020172579.97868894278386244544
26 × 113 × 6737 × 1414028591
2013-09-046737141402859115,59029.17154.478

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-11-24T00:00:00Grey Smithv4_computers40000420000---0.023--1.843%
2012-02-13T05:19:00bcp19Turion_x21000001825000---0.073--3.206%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-25T00:00:00ANONYMOUSv4_computers21262--0.071--
1999-04-02T00:00:00PHeedev4_computers21263--0.185--
1999-10-15T00:00:00ANONYMOUSv4_computers21264--0.412--


ECM factoring results:
Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-03-22T00:00:00ANONYMOUSv4_computersBFEA91459A1F4E0A2.256
2002-12-09T00:00:00Grey Smithv4_computersBFEA91459A1F4E0A2.256


PRP results:
dateuseridcompidcofactorsres64PRP
2018-12-09T22:29:05ATHec2-PRPCF
1190742114436393608102017
90C75A98C118A6__no
2020-08-13T05:12:07marssystemssystem03
1190742114436393608102017
90C75A98C118A69Bno


P-1 factor-bounds graph:
B1 = 100000, B2 = 1825000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 40000, B2 = 420000 (P-1 stage 2)
B1 = 40000 (P-1 stage 1)
102
103
104
105
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
264
263
262
250
260
270
280
290
2100
Last modified: 2020-08-13T05:12:07+00:00