is 2 2827387 - 1
has 851129 decimal digits
takes 0.218 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L68ACA43E3C283484double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26710.509367.1642 %3600002873801701.79168.0002 %12.300969.7911 %
Target2630.564565.0794 %1600013000000.00961.8262 %0.574165.7171 %
Difference+4+9.9448+2.0848 %+344000+286080170+1.7820+6.1740%+11.7268+4.0740 %

Known prime factors (1 factor, 71.2 bits, 0.00251764% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
282738726815655732131264294392271.184474212687052237
3 × 7 × 1949 × 11586227053
2010-10-31194911586227053320.5670.695132.04

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-11-28ANONYMOUSv4_computers2048204800--0.0010.684%
2023-01-30USAFSS6917th_Scty_Sq360000287380170--1.97411.284%


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


ECM factoring results:
Total ECM effort:0.463 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.220
50000500000030.243


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-02ANONYMOUSv4_computers68ACA43E3C2834840.218


PRP results:
dateuseridcompidcofactorsres64
2017-10-22Oliver KruseGTX-1
2681565573213126429439
00A53E383758B5CA
2017-12-07kkmrkkblmbrbkc4.xlarge
2681565573213126429439
00A53E383758B5CA


CERT results:
No CERT results for M2827387


P-1 factor-bounds graph:
B1 = 360000, B2 = 287380170 (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
1010
1011
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
280
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Last modified: 2024-03-13T02:15:48+00:00