is 2 1615591 - 1
has 486342 decimal digits
takes 0.072 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LCD930511B715E436double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.392068.6567%1000000200000000.13185.6741%18.523870.4352%1.7785%
PrimeNet2570.011963.1579%70001200000.00092.5529%0.012764.0984%0.9406%
GPU722610.190165.5738%6500600000.00061.0586%0.190765.9382%0.3644%
Difference+6+18.2018+3.0829%+993500+19940000+0.1312+4.6155%+18.3330+4.4970%+4.4970%

Known prime factors (1 factor, 80.1 bits, 0.00495596% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
161559112673491749298772923700572580.068392224633254913308
22 × 3 × 8849 × 3693681331741
2016-11-2288493693681331741265,33713,03424,343

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-11-23T13:31:00BigBrotherWinston100000020000000---0.132--5.674%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00Dry Creek Photov4_computers21257--0.012--
2003-07-21T00:00:00ANONYMOUSv4_computers21258--0.024--
2016-02-23T16:28:41Mark RoseManual testing258260--0.071--
2010-05-01T01:40:00Architects Cubedm1_tt260261--0.095--
2016-02-23T16:28:41Mark RoseManual testing261262--0.190--
2010-07-24T22:47:00GrunwalderGIMPManual testing21263--0.988--
2016-02-23T16:28:41Mark RoseManual testing262263--0.608--
2015-04-26T11:20:00omylistManual testing263264--1.215--
2015-04-27T10:26:00monstManual testing264265--2.313--
2015-10-11T16:52:29ramgeisManual testing265266--4.625--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.086 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.086 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024813.92
50000500000030.168


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-14T00:00:00Dry Creek Photov4_computersCD930511B715E4360.072
2015-07-19T18:02:00MadPooManual testingCD930511B715E4360.072


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T13:13:40Oliver KruseGTX-2
1267349174929877292370057
D21A1872ACD5F4__no
2017-11-01T10:20:12kkmrkkblmbrbkc4.xlarge
1267349174929877292370057
D21A1872ACD5F4__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
257
250
260
270
280
290
2100
Last modified: 2019-10-07T13:18:27+00:00