is 2 1608109 - 1
has 484090 decimal digits
takes 0.072 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- L-L tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.477668.6567%30000002730000001.14709.4549%19.624671.6202%2.9635%
PrimeNet2570.011963.1579%70001200000.00092.5506%0.012864.0976%0.9397%
GPU722610.191065.5738%6500600000.00061.0575%0.191665.9378%0.3641%
Difference+6+18.2865+3.0829%+2993500+272940000+1.1464+8.3973%+19.4330+5.6823%+5.6823%

Known prime factors (4 factors, 245.6 bits, 0.01527206% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1608109162483333371133.9205052
22 × 3 × 421
-44217.781e-101.731e-62.772e-6
160810931255721118891341.507971816
23 × 331 × 367
2008-07-153313672.459e-72.156e-54.363e-5
16081095717088362441991549.022177758111
177758111
2008-08-2611777581118.309e-50.62721.1715
1608109293404305862451540074094350339508592737121.142912264982853934466115463411807
3 × 31 × 1129 × 1571 × 1823 × 3511 × 4289 × 4397 × 45818189
2021-07-194397458181899.147e+100.16190.3020

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1608109507853375428035327435932375.427
160810992893157430040924845620632582.942
160810917869171946853835353551819112890.530
16081092903442622486503652414252038020066700738124.449
16081094767330964164215895132898682704794734965364839947155.062
1608109917056315911828763656307594129701316239801328610349162.650
160810916774183425365918416947263842133042860307275602874
73
52170.165
160810914900636709736570853152276692023891398511943413915
6293715711
60196.569
160810927255252375132590363770649285706502549638054024183
624849387401
62204.084
160810952428919914034413639061939095395863071400364617549
13552561066497
64211.672
160810985188256726210853729681759041158422515492175568927
887399631078491478910489
74245.591
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:17:18alpertronManual testing5000001500000012---0.084--4.990%
2021-07-19T01:01:39Dylan Delgadolaptop-ryzen73700300000027300000037121.1421.1470.1442.2949.455%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-08-26T20:19:00ANONYMOUSManual testing??49.022153.64505e-50.1588.00540e-5
2008-07-15T07:43:00J FeitsmaManual testing??41.507136.37202e-80.1581.40027e-7


ECM factoring results:

Old Calculation Method

Total ECM effort:14.080 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.080 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025114.08


Lucas-Lehmer results:
Exponent "1608109" not found


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T04:56:50Oliver KruseGTX-3
16248333337
3125572111889
571708836244199
E2EE87F1A6D566EFno
2017-10-04T00:05:19kkmrkkblmbrbkManual testing
16248333337
3125572111889
571708836244199
E2EE87F1A6D566__no
2017-11-13T23:18:36ATHec2-1xf
16248333337
3125572111889
571708836244199
E2EE87F1A6D566__no
2021-07-19T04:40:39SRJ2877LTOS
16248333337
3125572111889
571708836244199
2934043058624515400740943503395085927
2C9765E61957E243no


P-1 factor-bounds graph:
B1 = 3000000, B2 = 273000000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
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103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
2
230
240
250
260
270
280
290
2100
2110
2120
2130
Last modified: 2021-07-19T04:40:39+00:00