is 2 1905679 - 1
has 573667 decimal digits
takes 0.103 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L43B7F7DF6CAACC6Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26715.592368.6567 %500000150000000.10155.0934 %15.693870.2531 %
Target2610.161265.5738 %100008000000.00421.7284 %0.165466.1688 %
Difference+6+15.4311+3.0829 %+490000+14200000+0.0973+3.3650%+15.5284+4.0844 %

Known prime factors (1 factor, 65.5 bits, 0.00343539% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1905679510158550051975691032065.46813385217291369
3 × 7 × 11 × 24007 × 2413657
2011-06-062400724136577.55360.01210.0193

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-06-06kurlyslice2065.4680.2030.000%
2016-03-16alpertronManual testing5000001500000012
skipped known factor: 51015855005197569103
---8.903%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2002-01-02Jossv4_computers212580.020
2011-04-14GrunwalderGIMPv4_computers212610.161
2009-05-25Architects Cubedi4l_12602610.081
2011-02-08GrunwalderGIMPGWPrime022612630.676


ECM factoring results:
Total ECM effort:39.573 GHz-days
Estimated T-Level:25.711
DigitsB1CompleteFacMiss
201100015.1920.000%
25500001.69518.367%
302500000.14286.741%
3510000000.01099.036%


ECM Summary

B1B2factorcurvesGHz-days
500005000000161.003
500006238132141.068
50000660000021216.60
500006750000141.108
250000400000004619.80


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-10-07ANONYMOUSv4_computers43B7F7DF6CAACC6B0.103


PRP results:
dateuseridcompidcofactorsres64
2017-10-04Oliver KruseGTX-1
51015855005197569103
CE6A35A8B058D02E
2017-11-09kkmrkkblmbrbkc4.large
51015855005197569103
CE6A35A8B058D02E


CERT results:
No CERT results for M1905679


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
263
261
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
250
260
270
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00