is 2 12075143 - 1
has 3634981 decimal digits
takes 4.649 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8AA6954D2CD0188Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2684.936264.7059%30000060000000.34084.5609%5.277066.3156%1.6097%
PrimeNet2640.294862.5000%5500015000000.07474.1176%0.369464.0441%1.5441%
GPU722684.936264.7059%8000020000000.10312.9439%5.039265.7449%1.0390%
Difference---+220000+4000000+0.2378+1.6170%+0.2378+0.5707%+0.5707%

Known prime factors (1 factor, 73.4 bits, 0.00060799% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12075143126013216187880809953032373.416521787676501557
32 × 23 × 752183 × 3351197
2016-02-197521833351197287.930.49900.8546

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-04-21T00:00:00ANONYMOUSv4_computers180000180000---0.100--1.491%
2005-04-26T00:00:00dswansonv4_computers700001190000---0.073--2.539%
2015-02-06T13:03:00ThaManual testing3000006000000---0.341--4.561%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-05-17T00:00:00ANONYMOUSv4_computers21264--0.295--
2000-05-24T00:00:00ANONYMOUSv4_computers21264--0.295--
2013-09-22T01:28:00lycornManual testing264265--0.309--
2013-10-03T01:38:00NesowaManual testing265266--0.619--
2015-02-09T10:45:00ThaManual testing266267--1.238--
2015-05-27T23:22:00ThaManual testing267268--2.475--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.585 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.585 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.585


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2001-06-03T00:00:00ANONYMOUSv4_computers8AA6954D2CD0188E4.649
2004-09-16T00:00:00ThaumaTechv4_computersC7ADF4354B2B0B__4.649
2005-04-26T00:00:00dswansonv4_computers8AA6954D2CD0188E4.649


PRP results:
dateuseridcompidcofactorsres64PRP
2022-01-17T11:13:10krackerGRID-11
12601321618788080995303
CB5E9C502BAF65__no
2022-01-19T22:12:17LaurVbutu
12601321618788080995303
CB5E9C502BAF6502no


P-1 factor-bounds graph:
B1 = 300000, B2 = 6000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 180000 (P-1 stage 1)
B1 = 70000, B2 = 1190000 (P-1 stage 2)
B1 = 70000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
TF factor-bounds graph:
268
267
266
265
264
250
260
270
280
290
2100
Last modified: 2022-01-19T22:12:17+00:00