is 2 1616939 - 1
has 486748 decimal digits
takes 0.072 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LE9C95D1AA64E9964double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26718.376668.6567 %2000000200000000.19306.0006 %18.569770.5375 %
Target2610.190065.5738 %65003000000.00151.0588 %0.191465.9383 %
Difference+6+18.1867+3.0829 %+1993500+19700000+0.1916+4.9418%+18.3783+4.5992 %

Known prime factors (1 factor, 79.2 bits, 0.00489625% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16169396797677832564651100380092479.169210202049445422836
22 × 52550512361355709
2017-09-08452550512361355709141,867185,433,241346,337,655

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-11-25BigBrotherWinston10000002000000012--0.1329.636%
2017-07-18JossManual testing12000001200000012---8.916%
2017-08-16JossManual testing20000002000000012--0.1939.978%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-11-07ANONYMOUSv4_computers212570.012
2003-07-21ANONYMOUSv4_computers212580.024
2016-02-23Mark RoseManual testing2582600.071
2010-05-02Architects Cubedm1_tt2602610.095
2010-07-24GrunwalderGIMPManual testing212630.987
2016-02-23Mark RoseManual testing2612630.797
2015-04-27omylistManual testing2632641.214
2015-04-28monstManual testing2642652.311
2015-10-11ramgeisManual testing2652664.622


ECM factoring results:
Total ECM effort:31.277 GHz-days
Estimated T-Level:25.718
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.67418.740%
302500000.14486.623%
3510000000.01099.005%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001498.239
5000050000001025.725
250000400000005017.31


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-07ANONYMOUSv4_computersE9C95D1AA64E99640.072
2015-07-03MadPooManual testingE9C95D1AA64E99640.072


PRP results:
dateuseridcompidcofactorsres64
2017-10-02Oliver KruseGTX-3
679767783256465110038009
2368977CAB11ACF4
2017-11-01kkmrkkblmbrbkc4.xlarge
679767783256465110038009
2368977CAB11ACF4


CERT results:
No CERT results for M1616939


P-1 factor-bounds graph:
B1 = 2000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1200000, B2 = 12000000 (P-1 stage 2)
B1 = 1200000 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
1016
1017
TF factor-bounds graph:
266
265
264
263
261
260
258
257
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.72 ~= 69-bit
250
260
270
280
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00