is 2 2852849 - 1
has 858794 decimal digits
takes 0.220 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LE38318C9457EE67Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26710.415567.1642 %3600002960911801.84488.0385 %12.260369.8037 %
Target2630.559465.0794 %1600013000000.00961.8293 %0.569165.7182 %
Difference+4+9.8561+2.0848 %+344000+294791180+1.8351+6.2092%+11.6912+4.0855 %

Known prime factors (1 factor, 66.0 bits, 0.00231176% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2852849713291234874749124472065.95112501384315727
258787 × 48307621
2009-03-24258787483076212.55730.32220.5505

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-11-28ANONYMOUSv4_computers2048204800--0.0010.685%
2023-02-18USAFSS6917th_Scty_Sq360000296091180
skipped known factor: 71329123487474912447
--2.03311.333%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-02-13Sturle Sundegolan.ifi2602610.054


ECM factoring results:
Total ECM effort:0.162 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.162


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-09ANONYMOUSv4_computersE38318C9457EE67B0.220


PRP results:
dateuseridcompidcofactorsres64
2017-10-22alpertronlaptop2
71329123487474912447
9CF8BDF6695486EB
2017-11-16Oliver KruseThreadripper-PC
71329123487474912447
9CF8BDF6695486EB


CERT results:
No CERT results for M2852849


P-1 factor-bounds graph:
B1 = 360000, B2 = 296091180 (P-1 stage 2)
B1 = 360000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
TF factor-bounds graph:
261
this exponent TF target: 63
TF double-checked to: 67
250
260
270
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Last modified: 2024-02-09T03:30:02+00:00