is 2 1508407 - 1
has 454076 decimal digits
takes 0.067 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.698968.6567%500000150000000.08354.9517%19.782470.2088%1.5520%
PrimeNet2570.012763.1579%65001000000.00082.3430%0.013564.0211%0.8632%
GPU722610.203665.5738%6000500000.00050.9491%0.204265.9005%0.3268%
Difference+6+19.4952+3.0829%+494000+14950000+0.0830+4.0026%+19.5782+4.3082%+4.3082%

Known prime factors (2 factors, 107.0 bits, 0.00709237% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15084074360140937931238.666144528
24 × 3 × 3011
-1630113.115e-81.160e-51.987e-5
15084073674823266118282987912168.316121811396596485
3 × 5 × 41 × 73 × 2713250843
2018-10-3173271325084355.8579.57417.882

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
150840716022747362259956377227070250426333106.982
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:15:38alpertronManual testing5000001500000012-
skipped known factor: 436014093793
--0.084--4.952%


Trial Factoring results:
No TF results for M1508407


ECM factoring results:

Old Calculation Method

Total ECM effort:30.079 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:30.079 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.35725.749%
302500000.11389.315%
3510000000.00899.236%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025013.94
50000500000010.056
250000350000005016.09


Lucas-Lehmer results:
No L-L results for M1508407


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T11:14:08Oliver KruseGTX-2
436014093793
A5C68EDF138B7C__no
2017-10-29T13:02:12kkmrkkblmbrbkold
436014093793
A5C68EDF138B7C__no
2018-10-30T15:04:32rucio
436014093793
367482326611828298791
D2AD516AE16FDA__no
2018-11-02T09:55:21ZeroI5
436014093793
367482326611828298791
D2AD516AE16FDA__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
230
240
250
260
270
280
290
2100
Last modified: 2022-03-17T11:20:44+00:00