is 2 2392571 - 1
has 720236 decimal digits
takes 0.162 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD6F38FDF35482740double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.419267.1642%2000000600000000.50557.6128%12.924769.6639%2.4997%
PrimeNet2590.032162.7119%100001700000.00182.4782%0.033963.6359%0.9241%
GPU722630.667165.0794%100001400000.00171.2740%0.668765.5243%0.4449%
Difference+4+11.7522+2.0848%+1990000+59860000+0.5038+6.3388%+12.2559+4.1397%+4.1397%

Known prime factors (1 factor, 70.2 bits, 0.00293580% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
239257113952688190576912778392270.241291583576633189
41 × 194521 × 36560549
2015-06-2619452136560549158.040.21310.3644

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-09T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.287%
2003-02-24T00:00:00ANONYMOUSv4_computers4096409600---0.003--0.572%
2003-09-21T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.287%
2010-12-16T22:39:00Jocelyn LaroucheManual testing2000020000---0.002--0.311%
2011-01-01T10:27:00Oscar Östlin7501175011---0.007--0.793%
2011-01-22T16:24:00Oscar Östlin900001845000---0.018--2.603%
2014-08-21T02:33:00Jocelyn LaroucheManual testing116826116826---0.011--1.027%
2014-11-06T23:05:00Jocelyn LaroucheManual testing143652143652---0.014--1.150%
2018-09-28T16:25:14alpertronManual testing20000006000000012-
skipped known factor: 1395268819057691277839
--0.505--7.613%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-01T00:00:00ANONYMOUSv4_computers21259--0.032--
2022-03-09T16:37:57LordJuliusManual testing21260--0.064--
2009-01-17T18:25:00Sturle Sundegassmann.ifi260261--0.064--
2012-06-02T07:43:00Sebastian HornbostelManual testing261262--0.128--
2013-12-04T21:14:00Jerry HallettManual testing262263--0.410--
2015-03-10T10:44:00VictordeHollanderManual testing263264--0.821--
2015-03-10T10:44:00VictordeHollanderManual testing264265--1.562--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.246 GHz-days
Estimated T-Level:0.700
DigitsB1CurvesCompleteFacMiss
201100014 / 1000.14086.875%
255000014 / 2800.05095.114%

New Calculation Method

Total ECM effort:1.246 GHz-days
Estimated T-Level:0.700
DigitsB1CompleteFacMiss
20110000.45263.660%
25500000.04196.001%
302500000.00399.749%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.068
50000500000020.178


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-05-23T00:00:00ANONYMOUSv4_computersD6F38FDF354827400.162
1999-03-26T00:00:00ANONYMOUSv4_computersD6F38FDF354827400.162


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-12T20:16:12Oliver KruseGTX-058693E6B405356__no
2017-11-26T01:13:40kkmrkkblmbrbkc4.xlarge
1395268819057691277839
58693E6B405356__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 90000, B2 = 1845000 (P-1 stage 2)
B1 = 143652 (P-1 stage 1)
B1 = 116826 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 75011 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 4096 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
267
265
264
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-09T16:37:57+00:00