is 2 6247811 - 1
has 1880779 decimal digits
takes 1.107 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L7E14389E2ED7F68Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2674.755965.6716 %11500023287500.06053.3095 %4.816466.8077 %
Target2662.363865.1515 %4000045000000.07272.4334 %2.436565.9995 %
Difference+1+2.3921+0.5201 %+75000-2171250-0.0122+0.8761%+2.3799+0.8082 %

Known prime factors (1 factor, 68.9 bits, 0.00110223% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
62478115376013567928399753272168.86543023176980933
43023176980933
2016-09-141430231769809339.540602,3481,125,019

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-06-17Carsten Kossendeymother30000457500--0.0141.909%
2013-04-29Squeeky_SquirrelP4_260011500023287506--0.0613.702%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-07-11ANONYMOUSv4_computers212620.049
2016-02-23Mark RoseManual testing2622630.157
2014-09-12NesowaManual testing2632640.314
2014-09-16monstManual testing2642650.598
2015-10-14snme2pm1Manual testing2652661.196
2016-03-22Gordon SpenceManual testing2662672.392


ECM factoring results:
Total ECM effort:1.886 GHz-days
Estimated T-Level:1.346
DigitsB1CompleteFacMiss
20110000.26976.397%
25500000.02597.540%
302500000.00299.843%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.617
50000500000010.269


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28ANONYMOUSv4_computers7E14389E2ED7F68A1.107
2000-12-21Stefan Rinkv4_computers7E14389E2ED7F68A1.107


PRP results:
dateuseridcompidcofactorsres64
2017-10-16kkmrkkblmbrbkc4.xlarge
537601356792839975327
FECB4B881AFCD7D5
2018-09-25rucio
537601356792839975327
FECB4B881AFCD7D5


CERT results:
No CERT results for M6247811


P-1 factor-bounds graph:
B1 = 115000, B2 = 2328750 (P-1 stage 2)
B1 = 115000 (P-1 stage 1)
B1 = 30000, B2 = 457500 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
TF factor-bounds graph:
267
266
265
264
263
262
this exponent TF target: 66
TF double-checked to: 67
ECM T-Level=1.35 ~= -12-bit
250
260
270
JSON version of this page
Last modified: 2024-02-09T03:30:02+00:00