is 2 3727177 - 1
has 1121993 decimal digits
takes 0.391 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L47F7904430A1FCC2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27064.110468.5714 %140000007000000007.823910.2486 %71.934371.7924 %
Target2640.955065.6250 %2200022500000.02182.1084 %0.976866.3498 %
Difference+6+63.1554+2.9464 %+13978000+697750000+7.8021+8.1402%+70.9575+5.4427 %

Known prime factors (1 factor, 82.3 bits, 0.00220717% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
372717758108653953060807229903292582.265779526354034981532
22 × 7 × 25648781 × 1085440549
2022-11-12256487811085440549262,79112.69916.821

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-07-06Carsten Kossendeymother20000265000--0.0051.779%
2012-12-22Squeeky_SquirrelP4_2600250000768750012--0.1006.030%
2021-05-24axnManual testing14000000700000000--7.82415.230%


Trial Factoring results:
5758596061626364656667686970
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1997-12-21ANONYMOUSv4_computers212600.021
2009-03-05S485122USB-Z2602610.041
2011-05-01Grant McCrackenthumper2612620.082
2012-04-20GrunwalderGIMPManual testing212630.428
2016-02-23Mark RoseManual testing2622630.263
2015-01-22VictordeHollanderManual testing2632640.527
2015-01-22VictordeHollanderManual testing2642651.002
2016-02-25ramgeisManual testing2652662.005
2016-11-03Gordon SpenceManual testing2662674.010
2018-11-05TJAOIManual testing2672688.020
2020-12-13axnManual testing26826916.04
2021-03-13axnManual testing26927032.08


ECM factoring results:
Total ECM effort:7.369 GHz-days
Estimated T-Level:20.875
DigitsB1CompleteFacMiss
20110001.89115.092%
25500000.17583.941%
302500000.01198.899%


ECM Summary

B1B2factorcurvesGHz-days
500005000000334.778
50000500000010.149
50000675000071.214
50000690000071.228


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1997-12-30Joel Armengaudv4_computers47F7904430A1FCC20.391
1998-01-16Joel Armengaudv4_computers47F7904430A1FCC20.391
1999-12-15ANONYMOUSv4_computers47F7904430A1FCC20.391


PRP results:
dateuseridcompidcofactorsres64
2022-11-17MarkSdesktop-i7
5810865395306080722990329
93747FB5B2A43181


CERT results:
dateuseridcompid
2022-11-17LookASIT-18


P-1 factor-bounds graph:
B1 = 14000000, B2 = 700000000 (P-1 stage 2)
B1 = 14000000 (P-1 stage 1)
B1 = 250000, B2 = 7687500 (P-1 stage 2)
B1 = 250000 (P-1 stage 1)
B1 = 20000, B2 = 265000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
103
104
105
106
107
108
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
270
269
268
267
266
265
264
263
262
261
260
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=20.88 ~= 53-bit
250
260
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290
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Last modified: 2024-02-29T14:28:04+00:00