is 2 2785339 - 1
has 838471 decimal digits
takes 0.215 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L0FA873F5FD157F01double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26710.668067.1642 %2880002264238901.41217.4968 %12.080069.6258 %
Target2630.573065.0794 %1500012000000.00891.7481 %0.581965.6898 %
Difference+4+10.0950+2.0848 %+273000+225223890+1.4031+5.7487%+11.4981+3.9360 %

Known prime factors (1 factor, 61.8 bits, 0.00222050% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
278533941519351078500315211961.848745319529840
24 × 3 × 5 × 3105498041
2009-03-211631054980410.171918.94935.391

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-11-17ANONYMOUSv4_computers2048204800--0.0010.681%
2023-01-27USAFSSUSAFSACS288000226423890--1.55610.685%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-02-01Sturle Sundegaudi.ifi2602610.055


ECM factoring results:
Total ECM effort:0.393 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.081
50000500000030.312


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-27sutekh137v4_computers0FA873F5FD157F010.215


PRP results:
dateuseridcompidcofactorsres64
2017-10-21Oliver KruseGTX-2
4151935107850031521
975515AAFE9692D6
2017-12-06kkmrkkblmbrbkold
4151935107850031521
975515AAFE9692D6


CERT results:
No CERT results for M2785339


P-1 factor-bounds graph:
B1 = 288000, B2 = 226423890 (P-1 stage 2)
B1 = 288000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (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:
261
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00