is 2 2341987 - 1
has 705009 decimal digits
takes 0.158 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L64BBFE376E7A72E2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26712.687567.1642 %500000150000000.12645.2211 %12.813868.8786 %
Target2620.262364.5161 %1300010000000.00651.7853 %0.268965.1496 %
Difference+5+12.4252+2.6481 %+487000+14000000+0.1198+3.4358%+12.5450+3.7290 %

Known prime factors (1 factor, 69.2 bits, 0.00295645% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
23419876969415808488987052472169.240148792794505029
34 × 19 × 67 × 73 × 19767221
2016-02-17811976722150.9770.10550.1970

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-21ANONYMOUSv4_computers2048204800--0.0010.792%
2010-03-01Budannan5000001000000012--0.1027.764%
2018-03-18alpertronManual testing5000001500000012---8.328%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2016-02-23Mark RoseManual testing212600.066
2009-01-14Sturle Sundegimo.ifi2602610.066
2012-05-28Sebastian HornbostelManual testing2612620.131
2013-12-04Luigi MorelliManual testing2622630.419
2015-03-06VictordeHollanderManual testing2632640.838
2015-03-06VictordeHollanderManual testing2642651.595
2015-10-26ramgeisManual testing2652663.191


ECM factoring results:
Total ECM effort:6.643 GHz-days
Estimated T-Level:21.278
DigitsB1CompleteFacMiss
20110002.7766.231%
25500000.25677.443%
302500000.01698.392%


ECM Summary

B1B2factorcurvesGHz-days
500005000000151.208
50000500000030.266
500006620423505.169


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-31ANONYMOUSv4_computers64BBFE376E7A72E20.158


PRP results:
dateuseridcompidcofactorsres64
2017-10-12Oliver KruseGTX-0
696941580848898705247
5D3236A4BDD8F6FE
2017-11-24kkmrkkblmbrbkc4.xlarge
696941580848898705247
5D3236A4BDD8F6FE


CERT results:
No CERT results for M2341987


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000, B2 = 10000000 (P-1 stage 2)
B1 = 500000 (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
TF factor-bounds graph:
266
265
264
263
262
261
260
this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=21.28 ~= 54-bit
250
260
270
JSON version of this page
Last modified: 2024-02-29T14:28:04+00:00