is 2 1865551 - 1
has 561587 decimal digits
takes 0.101 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD2F34E9F166ADDC1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.927768.6567%500000150000000.10155.0803%16.029270.2491%1.5923%
PrimeNet2570.010363.1579%90001600000.00143.0278%0.011664.2734%1.1155%
GPU722610.164765.5738%100001500000.00141.6888%0.166066.1552%0.5814%
Difference+6+15.7630+3.0829%+490000+14850000+0.1001+3.3915%+15.8631+4.0939%+4.0939%

Known prime factors (1 factor, 74.4 bits, 0.00398926% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1865551253018596150228499437372374.4226781336885194468
22 × 3 × 7741367 × 72998917
2013-02-127741367729989172,418.40.88861.2393

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-07T14:22:00markrtiny2750006000000---0.046--3.926%
2016-03-16T12:37:29alpertronManual testing5000001500000012---0.101--5.080%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-06T12:16:00Architects CubedManual testing260261--0.082--
2011-03-08T05:14:00GrunwalderGIMPManual testing21263--0.856--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.570 GHz-days
Estimated T-Level:24.554
DigitsB1CurvesCompleteFacMiss
2011000255 / 1002.5507.709%
2550000255 / 2800.91140.158%

New Calculation Method

Total ECM effort:19.570 GHz-days
Estimated T-Level:24.554
DigitsB1CompleteFacMiss
201100010.5030.003%
25500000.96738.036%
302500000.06194.050%
3510000000.00399.712%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000382.630
50000660000021716.94


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computersD2F34E9F166ADDC10.101


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T10:03:10Oliver KruseGTX-1
25301859615022849943737
F9BC62764647EE__no
2017-11-07T14:30:03kkmrkkblmbrbkold
25301859615022849943737
F9BC62764647EE__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
104
105
106
107
104
105
106
107
108
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
Last modified: 2021-09-03T08:16:49+00:00