is 2 8255479 - 1
has 2485147 decimal digits
takes 2.156 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L0656D4731BE23678double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2673.599365.6716 %350002625000.01791.5410 %3.617266.2006 %
Target2687.220066.1765 %5000055000000.13142.1818 %7.351466.9144 %
Difference-1-3.6207-0.5048 %-15000-5237500-0.1134-0.6408 %-3.7341-0.7138 %

Known prime factors (1 factor, 75.6 bits, 0.00091587% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
8255479576514975489257897979272375.6103491711234982597
3 × 11 × 2939 × 154409 × 233159
2011-11-031544092331591,516.10.06010.1190

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-08-24borgygv4_computers35000262500--0.0181.341%
2011-11-03James Heinrichi7-9202375.6100.1730.000%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-09-06ANONYMOUSv4_computers212610.019
1998-09-27ANONYMOUSv4_computers212620.037
1999-02-21ANONYMOUSv4_computers212630.119
2000-01-12Mark Blankev4_computers212640.238


ECM factoring results:
No ECM results for M8255479


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-02-09ANONYMOUSv4_computers0656D4731BE236782.156
2002-09-14Team Prime Ribv4_computers0656D4731BE236782.156


PRP results:
dateuseridcompidcofactorsres64
2018-10-27rucio
57651497548925789797927
C83F74EF52FEA700
2018-10-28J.R. Allenlapacer
57651497548925789797927
C83F74EF52FEA700


CERT results:
No CERT results for M8255479


P-1 factor-bounds graph:
B1 = 35000, B2 = 262500 (P-1 stage 2)
B1 = 35000 (P-1 stage 1)
103
104
105
106
103
104
105
106
TF factor-bounds graph:
264
263
262
261
this exponent TF target: 68
TF double-checked to: 67
250
260
270
280
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00