is 2 2820089 - 1
has 848932 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-L95BB9FE66CDFD8A1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26710.536567.1642 %3600002873801701.79167.9979 %12.328169.7904 %
Target2630.565965.0794 %1500013000000.00951.7922 %0.575565.7052 %
Difference+4+9.9706+2.0848 %+345000+286080170+1.7821+6.2058%+11.7527+4.0852 %

Known prime factors (1 factor, 77.2 bits, 0.00273688% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
28200891715040349215310687542472477.18330407557158928507
23 × 31 × 33679 × 1266288941
2016-02-1733679126628894110,8547.730014.431

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-11-28ANONYMOUSv4_computers2048204800--0.0010.683%
2023-01-29USAFSS6917th_Scty_Sq360000287380170--1.97411.282%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2016-02-23Mark RoseManual testing212600.054
2009-02-14Sturle Sundefizir.ifi2602610.054
2012-02-19Grant McCrackenthumper2612620.109
2013-01-10dbaughManual testing2622630.348
2015-04-21VictordeHollanderManual testing2632640.696
2015-04-21VictordeHollanderManual testing2642651.325
2016-02-12ramgeisManual testing2652662.650


ECM factoring results:
Total ECM effort:1.346 GHz-days
Estimated T-Level:2.692
DigitsB1CompleteFacMiss
20110000.53858.365%
25500000.05095.140%
302500000.00399.686%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.143
50000500000020.203


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-27ANONYMOUSv4_computers95BB9FE66CDFD8A10.218
1999-07-27ANONYMOUSv4_computers95BB9FE66CDFD8A10.218


PRP results:
dateuseridcompidcofactorsres64
2017-10-22Oliver KruseGTX-3
171504034921531068754247
1EC7C016165FA01F
2017-12-07kkmrkkblmbrbkc4.xlarge
171504034921531068754247
1EC7C016165FA01F


CERT results:
No CERT results for M2820089


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
TF factor-bounds graph:
266
265
264
263
262
261
260
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=2.69 ~= -8-bit
250
260
270
280
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Last modified: 2024-02-29T14:28:04+00:00