is 2 2395927 - 1
has 721246 decimal digits
takes 0.162 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LC93727A7BB0809ECdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26824.877667.6471 %30000001000000000.81157.8455 %25.689170.1853 %
Target2630.666165.0794 %100007000000.00471.2744 %0.670865.5244 %
Difference+5+24.2114+2.5677 %+2990000+99300000+0.8069+6.5711%+25.0183+4.6609 %

Known prime factors (1 factor, 81.2 bits, 0.00339034% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
239592728358374205261646301320492581.230591803802980258712
23 × 3 × 43 × 573453297461491
2020-04-0443573453297461491204,4023,060,4575,716,081

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-21ANONYMOUSv4_computers2048204800--0.0010.654%
2010-11-08JossManual testing1500015000--0.0020.497%
2010-11-15JossManual testing2000020000--0.0020.616%
2010-12-24markrtiny9000018450006--0.0194.138%
2014-08-21JossManual testing116789116789--0.0121.764%
2014-11-06JossManual testing143578143578--0.0141.948%
2015-12-07mikrMSI300000010000000012--0.81211.568%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-03-15ANONYMOUSv4_computers212590.016
2016-02-23Mark RoseManual testing2592600.032
2009-01-15Sturle Sundekrebs.ifi2602610.064
2012-06-02Sebastian HornbostelManual testing2612620.128
2013-12-04Jerry HallettManual testing2622630.410
2015-03-12VictordeHollanderManual testing2632640.819
2015-03-12VictordeHollanderManual testing2642651.559
2015-11-04ramgeisManual testing2652663.119
2017-06-27Gordon SpenceManual testing2662676.238
2019-03-04TJAOIManual testing26726812.48


ECM factoring results:
Total ECM effort:3.176 GHz-days
Estimated T-Level:20.658
DigitsB1CompleteFacMiss
20110001.42324.097%
25500000.13287.663%
302500000.00899.173%


ECM Summary

B1B2factorcurvesGHz-days
500005000000363.087
50000500000010.089


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-02ANONYMOUSv4_computersC93727A7BB0809EC0.162
2018-05-17kkmrkkblmbrbkoldC93727A7BB0809EC0.162


PRP results:
dateuseridcompidcofactorsres64
2020-04-04oodairacom1
2835837420526164630132049
FF136D24036C25B7
2020-04-05Christoph ZengerManual testing
2835837420526164630132049
FF136D24036C25B7
2020-04-06Ivan MLAB
2835837420526164630132049
FF136D24036C25B7


CERT results:
No CERT results for M2395927


P-1 factor-bounds graph:
B1 = 3000000, B2 = 100000000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 90000, B2 = 1845000 (P-1 stage 2)
B1 = 143578 (P-1 stage 1)
B1 = 116789 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=20.66 ~= 52-bit
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Last modified: 2024-02-29T14:28:04+00:00