is 2 1997701 - 1
has 601368 decimal digits
takes 0.131 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L8BD18AC32BE7CDA4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26714.874168.6567 %1000000300000000.24606.2527 %15.120070.6165 %
Target2620.307566.1290 %80005500000.00361.2363 %0.311166.5478 %
Difference+5+14.5665+2.5277 %+992000+29450000+0.2424+5.0164%+14.8089+4.0687 %

Known prime factors (1 factor, 65.5 bits, 0.00327690% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1997701508434710632689517032065.46312725495723151
35 × 59 × 887598223
2013-01-032438875982233.65204.61048.6110

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-03-05kurlyhex10000003000000012--0.2469.660%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-12-27Ethan O'Connorv4_computers212580.019
2009-04-17Rob_Deetwopc2602610.077
2011-05-03XyzzyManual testing212620.307
2011-05-03XyzzyManual testing2622630.491
2011-05-03XyzzyManual testing2632640.983
2011-05-03XyzzyManual testing2642651.870


ECM factoring results:
Total ECM effort:27.473 GHz-days
Estimated T-Level:25.338
DigitsB1CompleteFacMiss
201100011.1930.001%
25500001.05834.701%
302500000.06893.470%
3510000000.00399.682%


ECM Summary

B1B2factorcurvesGHz-days
10.147
500005000000231.657
50000675000070.587
50000684153770.680
50000690000070.593
50000750000021822.16
500002702353571.646


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02Ethan O'Connorv4_computers8BD18AC32BE7CDA40.131


PRP results:
dateuseridcompidcofactorsres64
2017-10-05Oliver KruseGTX-2
50843471063268951703
FE8B480B8A3AD327
2017-11-13kkmrkkblmbrbkold
50843471063268951703
FE8B480B8A3AD327


CERT results:
No CERT results for M1997701


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
265
264
263
262
261
258
this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=25.34 ~= 68-bit
250
260
270
JSON version of this page
Last modified: 2024-02-29T14:28:04+00:00