is 2 13268561 - 1
has 3994235 decimal digits
takes 5.887 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 L-L tests remaining
ResidueStatus
L-L4FF41F54456A726Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27136.030966.1972%16000023600000.18002.4849%36.211067.0371%0.8400%
PrimeNet2640.268362.5000%6000017000000.09614.3501%0.364364.1313%1.6313%
GPU722684.492264.7059%9000024000000.13893.1784%4.631165.8277%1.1218%
Difference+3+31.5387+1.4913%+70000-40000+0.0412-0.6935%+31.5799+1.2095%+1.2095%

Known prime factors (1 factor, 75.0 bits, 0.00056487% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
13268561364956108810709221442812374.9501375266348817740
22 × 32 × 5 × 19 × 379 × 643 × 1650101
2021-08-236431650101374.470.05820.1080

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-02-24T00:00:00ANONYMOUSv4_computers1600002360000---0.180--2.485%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-08-23T22:05:16ATHec2-P_1200000760000027P-12374.9500.414


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-05-10T00:00:00ANONYMOUSv4_computers?264--0.148--
2013-05-16T16:48:00lycornManual testing264265--0.282--
2014-06-01T00:16:00NesowaManual testing265266--0.563--
2015-07-20T10:34:00NesowaManual testing266267--1.126--
2017-12-22T13:48:32-Anonymous-Manual testing267268--2.253--
2018-01-14T22:56:56ramgeisManual testing268269--4.506--
2021-08-07T17:49:10SRBaseManual testing269270--9.011--
2021-08-31T20:23:55SRBaseManual testing270271--18.02--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.675 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.675 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03296.826%
25500000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.675


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-03-24T00:00:00ANONYMOUSv4_computers4FF41F54456A726C5.887
2005-02-12T00:00:00Sturle Sundev4_computers4FF41F54456A726C5.887


PRP results:
Exponent "13268561" not found


P-1 factor-bounds graph:
B1 = 200000, B2 = 7600000 (P-1 stage 2)
B1 = 160000, B2 = 2360000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 160000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
TF factor-bounds graph:
271
270
269
268
267
266
265
264
250
260
270
280
290
2100
Last modified: 2021-08-31T20:23:55+00:00