is 2 5083957 - 1
has 1530424 decimal digits
takes 0.705 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L0362EEBBD2CCBFB0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.844665.6716%150000015000000.30153.4821%6.146166.8670%1.1954%
PrimeNet2610.060462.2951%220005000000.00973.4077%0.070163.5800%1.2849%
GPU722651.435064.6154%340007000000.01412.4228%1.449265.4727%0.8573%
Difference+2+4.4096+1.0563%+1466000+800000+0.2874+1.0593%+4.6970+1.3943%+1.3943%

Known prime factors (1 factor, 90.0 bits, 0.00177080% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
508395712609858247969098888139153672890.027124016177241163712519
7 × 1889 × 26861 × 281857 × 1238789
2017-07-25281857123878986,460,4130.06710.1153

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-03-27T00:00:00ANONYMOUSv4_computers25000281250---0.008--1.326%
2009-08-21T18:45:00harleeP4_260055000907500---0.020--2.227%
2017-07-25T16:12:20mikrS068150000015000002890.0270.3011.4090.6033.482%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:08Mark RoseManual testing21261--0.060--
2008-12-29T20:33:00Sturle Sundebruckner.ifi261262--0.060--
2009-07-27T03:14:00GrunwalderGIMPManual testing21263--0.314--
2016-02-23T16:39:08Mark RoseManual testing262263--0.193--
2014-09-01T13:54:00krackerManual testing263264--0.386--
2014-09-15T12:51:00monstManual testing264265--0.735--
2015-08-03T11:44:00snme2pm1Manual testing265266--1.470--
2016-05-24T17:43:32Gordon SpenceManual testing266267--2.940--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.897 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.897 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.29074.802%
25500000.02697.410%
302500000.00299.839%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.897


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-01T00:00:00ANONYMOUSv4_computers5279C85B4D411C__0.705
1999-06-26T00:00:00ANONYMOUSv4_computers0362EEBBD2CCBFB00.705
2000-04-27T00:00:00ANONYMOUSv4_computers0362EEBBD2CCBFB00.705


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T13:09:49alpertronManual testing
1260985824796909888813915367
77884A550CE196__no
2018-01-19T12:42:09kkmrkkblmbrbkc4.xlarge
1260985824796909888813915367
77884A550CE196__no


P-1 factor-bounds graph:
B1 = 1500000 (P-1 stage 1)
B1 = 55000, B2 = 907500 (P-1 stage 2)
B1 = 55000 (P-1 stage 1)
B1 = 25000, B2 = 281250 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
TF factor-bounds graph:
267
266
265
264
263
262
261
250
260
270
280
290
2100
Last modified: 2018-01-19T12:42:09+00:00