is 2 1508401 - 1
has 454074 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
Actual26719.699068.6567%500000150000000.08354.9517%19.782570.2087%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+19.4953+3.0829%+494000+14950000+0.0830+4.0026%+19.5783+4.3082%+4.3082%

Known prime factors (1 factor, 28.1 bits, 0.00186353% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1508401289612993928.11096
25 × 3
-32322.420e-112.073e-64.218e-6

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:15:38alpertronManual testing5000001500000012-
skipped known factor: 289612993
--0.084--4.952%


Trial Factoring results:
No TF results for M1508401


ECM factoring results:

Old Calculation Method

Total ECM effort:30.078 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:30.078 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025113.99
250000350000005016.09


Lucas-Lehmer results:
No L-L results for M1508401


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T11:03:03Oliver KruseGTX-2
289612993
4306B66E60F3DA__no
2017-10-29T13:24:18kkmrkkblmbrbkold
289612993
4306B66E60F3DA__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
TF factor-bounds graph:
267
220
230
240
250
260
270
280
290
2100
Last modified: 2022-03-17T11:20:44+00:00