is 2 2385121 - 1
has 717993 decimal digits
takes 0.161 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2B3740BC2BF18D8Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.458067.1642%2000000600000000.50557.6104%12.963569.6631%2.4989%
PrimeNet2590.032262.7119%100001700000.00182.4767%0.034063.6354%0.9235%
GPU722630.669265.0794%100001400000.00171.2732%0.670865.5240%0.4446%
Difference+4+11.7889+2.0848%+1990000+59860000+0.5038+6.3372%+12.2927+4.1391%+4.1391%

Known prime factors (1 factor, 71.3 bits, 0.00298732% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
238512128104347492413138650232271.251589159784606591
11 × 227 × 235947050303
2015-06-25227235947050303372.791,259.22,351.9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.287%
2010-11-08T01:30:00Jocelyn LaroucheManual testing1500015000---0.001--0.243%
2010-11-15T22:51:00Jocelyn LaroucheManual testing2000020000---0.002--0.311%
2010-12-26T16:34:00markrtiny1000002075000---0.020--2.730%
2014-09-15T22:12:00ANONYMOUSManual testing126910126910---0.012--1.074%
2018-09-28T16:24:27alpertronManual testing20000006000000012---0.505--7.610%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-01T00:00:00ANONYMOUSv4_computers21259--0.032--
2022-03-09T16:37:55LordJuliusManual testing21260--0.064--
2009-01-15T18:00:00Sturle Sundegoldiek.ifi260261--0.064--
2012-06-01T12:43:00Sebastian HornbostelManual testing261262--0.129--
2013-12-04T21:14:00Jerry HallettManual testing262263--0.412--
2015-03-09T12:36:00VictordeHollanderManual testing263264--0.823--
2015-03-09T12:36:00VictordeHollanderManual testing264265--1.567--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.245 GHz-days
Estimated T-Level:0.700
DigitsB1CurvesCompleteFacMiss
201100014 / 1000.14086.875%
255000014 / 2800.05095.114%

New Calculation Method

Total ECM effort:1.245 GHz-days
Estimated T-Level:0.700
DigitsB1CompleteFacMiss
20110000.45263.660%
25500000.04196.001%
302500000.00399.749%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.067
50000500000020.178


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-23T00:00:00ANONYMOUSv4_computers2B3740BC2BF18D8B0.161


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-13T16:30:15kkmrkkblmbrbkc4.xlargeB5D90A4F66AA4B__no
2017-11-02T13:37:28Oliver KruseGTX-2
2810434749241313865023
B5D90A4F66AA4B__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 100000, B2 = 2075000 (P-1 stage 2)
B1 = 126910 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
265
264
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-09T16:37:55+00:00