is 2 1707257 - 1
has 513936 decimal digits
takes 0.080 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L9103DF32252B52C6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26834.912769.1176 %100000002000000001.38889.1116 %36.301571.9315 %
Target2610.179965.5738 %70005000000.00231.3025 %0.182266.0222 %
Difference+7+34.7327+3.5439 %+9993000+199500000+1.3865+7.8091%+36.1192+5.9094 %

Known prime factors (1 factor, 71.2 bits, 0.00416803% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
170725726362021462018935050572271.159772057793935504
24 × 2473 × 19512176353
2020-03-05247319512176353280.0372.545135.49

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-01-29JossManual testing5000050000--0.0041.407%
2011-02-07Carsten Kossendeymother9000015075006--0.0114.719%
2014-03-31JossManual testing100000100000--0.0082.013%
2014-04-28ANONYMOUSManual testing150000150000--0.0122.425%
2014-10-05JossManual testing187595187595--0.0152.670%
2015-01-07JossManual testing281392281392--0.0223.148%
2015-02-13JossManual testing374532374532--0.0293.510%
2015-02-18VictordeHollanderManual testing1000000020000000012--1.60114.838%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-11-21ANONYMOUSv4_computers212570.011
2003-02-02ANONYMOUSv4_computers212580.022
2016-02-23Mark RoseManual testing2582600.067
2010-04-22Architects Cubeda3_bu22602610.090
2016-02-23Mark RoseManual testing2612620.180
2010-10-16GrunwalderGIMPManual testing212630.935
2016-02-23Mark RoseManual testing2622630.575
2015-02-13VictordeHollanderManual testing2632641.150
2015-02-13VictordeHollanderManual testing2642652.189
2015-08-31ramgeisManual testing2652664.377
2018-06-11TJAOIManual testing2662678.754
2019-07-17TJAOIManual testing26726817.51


ECM factoring results:
Total ECM effort:37.101 GHz-days
Estimated T-Level:25.714
DigitsB1CompleteFacMiss
201100014.9150.000%
25500001.68618.527%
302500000.14386.692%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
50000500000026016.59
50000500000030.178
250000400000004820.33


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13ANONYMOUSv4_computers9103DF32252B52C60.080
1999-05-09ANONYMOUSv4_computers9103DF32252B52C60.080
2015-07-19MadPooManual testing9103DF32252B52C60.093


PRP results:
dateuseridcompidcofactorsres64
2020-03-07mnd9mnd2
2636202146201893505057
881A8DDF144AEA14
2020-03-08Alvin BunkBADCAT
2636202146201893505057
881A8DDF144AEA14


CERT results:
No CERT results for M1707257


P-1 factor-bounds graph:
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 374532 (P-1 stage 1)
B1 = 281392 (P-1 stage 1)
B1 = 187595 (P-1 stage 1)
B1 = 90000, B2 = 1507500 (P-1 stage 2)
B1 = 150000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
258
257
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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260
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Last modified: 2024-02-29T14:28:04+00:00