is 2 2742073 - 1
has 825447 decimal digits
takes 0.212 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8D1A70320AC5137Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.836367.1642%2700000840000000.79848.3266%11.634769.8983%2.7341%
PrimeNet2590.028062.7119%120002200000.00262.8510%0.030663.7749%1.0631%
GPU722630.582065.0794%140002400000.00291.7081%0.585065.6758%0.5965%
Difference+4+10.2542+2.0848%+2686000+83760000+0.7955+6.6185%+11.0497+4.2225%+4.2225%

Known prime factors (1 factor, 99.0 bits, 0.00361046% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
27420736344464042601517055277168535533099.001115687365774024197300312
23 × 11 × 9199 × 10627 × 161779 × 83124647
2016-11-06161779831246475.975e+100.52430.9473

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-16T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.299%
2003-11-28T00:00:00Team Prime Ribv4_computers15000225000---0.003--0.933%
2010-12-19T21:44:00Jocelyn LaroucheManual testing2000020000---0.002--0.321%
2010-12-29T20:12:00Jocelyn LaroucheManual testing3000030000---0.003--0.440%
2011-01-21T23:29:00Jocelyn LaroucheManual testing5000050000---0.006--0.629%
2011-04-29T11:50:00James HeinrichWHS1850004625000---0.048--3.694%
2016-11-07T01:05:00mikrMSI270000084000000123099.0010.7980.4241.5978.327%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:20Mark RoseManual testing21260--0.056--
2009-01-31T10:20:00Sturle Sundezumthor.ifi260261--0.056--
2012-04-06T16:21:00markroldgamer261262--0.112--
2013-01-10T10:18:00dbaughManual testing262263--0.358--
2015-04-21T09:20:00VictordeHollanderManual testing263264--0.716--
2015-04-21T09:20:00VictordeHollanderManual testing264265--1.363--
2016-02-03T11:43:36ramgeisManual testing265266--2.725--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.869 GHz-days
Estimated T-Level:0.900
DigitsB1CurvesCompleteFacMiss
201100018 / 1000.18083.451%
255000018 / 2800.06493.763%

New Calculation Method

Total ECM effort:1.869 GHz-days
Estimated T-Level:0.900
DigitsB1CompleteFacMiss
20110000.58155.954%
25500000.05294.888%
302500000.00399.677%


ECM Summary

B1B2factorcurvesGHz-days
500005000000181.869


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-27T00:00:00twmossv4_computers0B58F7DB4E8CA9__0.212
1999-11-24T00:00:00ANONYMOUSv4_computers8D1A70320AC5137D0.212


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-20T09:01:36Oliver KruseGTX-3
634446404260151705527716853553
BDDA08B8DBD975__no
2017-12-05T21:45:02Chang Chia-Tcheexbpc13
634446404260151705527716853553
BDDA08B8DBD975__no


P-1 factor-bounds graph:
B1 = 2700000, B2 = 84000000 (P-1 stage 2)
B1 = 2700000 (P-1 stage 1)
B1 = 185000, B2 = 4625000 (P-1 stage 2)
B1 = 185000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 225000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2017-12-05T21:45:02+00:00