is 2 2399821 - 1
has 722419 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-L6C7FDE515A5C9694double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.381767.1642%2000000600000000.50557.6152%12.887269.6647%2.5005%
PrimeNet2590.032062.7119%100001700000.00182.4796%0.033863.6365%0.9246%
GPU722630.665165.0794%100001400000.00171.2748%0.666765.5245%0.4452%
Difference+4+11.7167+2.0848%+1990000+59860000+0.5038+6.3404%+12.2204+4.1402%+4.1402%

Known prime factors (2 factors, 130.9 bits, 0.00545297% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2399821338710022693184292872064.8777056985139583
3 × 53 × 21961 × 2021017
2018-02-152196120210172.96020.01280.0201
2399821730117761729318612972065.98515211921258488
23 × 3 × 1999 × 317073563
2009-01-3019993170735633.11291.69243.1605

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
2399821247298203644034429820243056418538660523940130.861
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.287%
2018-09-28T16:25:27alpertronManual testing20000006000000012-
skipped known factor: 33871002269318429287
--0.505--7.615%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-01T00:00:00ANONYMOUSv4_computers21259--0.032--
2022-03-09T16:37:58LordJuliusManual testing21260--0.064--
2009-01-15T19:30:00Sturle Sundeghibu.ifi260261--0.064--
2022-03-09T16:37:58LordJuliusManual testing261262--0.128--
2022-03-09T16:37:58LordJuliusManual testing262263--0.409--
2022-03-09T16:37:58LordJuliusManual testing263264--0.818--
2018-02-15T14:22:15TJAOIManual testing264265*64.877201.4770.3292.997


ECM factoring results:

Old Calculation Method

Total ECM effort:0.267 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.267 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000030.267


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00ANONYMOUSv4_computers6C7FDE515A5C96940.162


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-12T22:30:29Oliver KruseGTX-186822AFB58949D__no
2017-11-26T08:01:40kkmrkkblmbrbkc4.xlarge
73011776172931861297
86822AFB58949D__no
2018-02-17T12:32:15AdolfNorManual testing
33871002269318429287
73011776172931861297
86822AFB58949D__no
2018-02-17T17:12:18Oliver KruseGTX-0
33871002269318429287
73011776172931861297
86822AFB58949D__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (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
109
TF factor-bounds graph:
267
265
264
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-09T16:37:58+00:00