is 2 1352917 - 1
has 407269 decimal digits
takes 0.052 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L528F97351114CF8Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26721.962968.6567%500000150000000.07144.8869%22.034370.1884%1.5317%
PrimeNet2560.007162.5000%60001000000.00062.6141%0.007763.4803%0.9803%
GPU722600.113565.0000%5500400000.00040.9821%0.113965.3437%0.3437%
Difference+7+21.8493+3.6567%+494500+14960000+0.0710+3.9048%+21.9203+4.8447%+4.8447%

Known prime factors (1 factor, 67.1 bits, 0.00495618% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
13529171530977816289471015112167.05356580626021015
5 × 23 × 1021 × 481885841
2009-04-30102148188584125.0001.45352.7147

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers15000217500---0.001--0.798%
2016-03-17T19:05:24alpertronManual testing5000001500000012---0.071--4.887%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-03T00:00:00ANONYMOUSv4_computers21257--0.014--
2003-07-06T00:00:00ANONYMOUSv4_computers21258--0.028--
2022-03-07T17:32:36LordJuliusManual testing258260--0.085--
2009-02-21T01:52:00Sturle Sundegibus.ifi260261--0.114--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.165 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000300 / 1003.0004.904%
2550000300 / 2801.07134.186%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.165 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6150.000%
25500001.64719.258%
302500000.14186.886%
3510000000.01099.022%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025011.70
250000350000005013.47


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2010-03-17T00:00:00Bruce A Metcalfv4_computers528F97351114CF8C0.052


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T07:56:07Oliver KruseGTX-1
153097781628947101511
764EE8209223E7__no
2017-10-24T16:05:40kkmrkkblmbrbkc4.xlarge
153097781628947101511
764EE8209223E7__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
261
260
258
257
250
260
270
280
290
2100
Last modified: 2022-03-07T17:32:36+00:00