is 2 1566083 - 1
has 471438 decimal digits
takes 0.070 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
Actual26718.973468.6567%500000150000000.08354.9742%19.056970.2158%1.5591%
PrimeNet2570.012363.1579%70001100000.00082.4763%0.013164.0702%0.9123%
GPU722610.196165.5738%6500600000.00061.0513%0.196865.9357%0.3619%
Difference+6+18.7773+3.0829%+493500+14940000+0.0829+3.9229%+18.8602+4.2801%+4.2801%

Known prime factors (2 factors, 103.9 bits, 0.00663573% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1566083251199713211134.5488020
22 × 5 × 401
-54012.537e-91.721e-62.640e-6
15660837644136431900765820392169.373244052723639193
3 × 7 × 11621558268533
2017-12-03711621558268533150.1541,00976,593

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
15660831920204879431585069261338370351932103.921
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:16:24alpertronManual testing5000001500000012-
skipped known factor: 25119971321
--0.084--4.974%


Trial Factoring results:
No TF results for M1566083


ECM factoring results:

Old Calculation Method

Total ECM effort:31.285 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:31.285 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.67418.740%
302500000.14486.623%
3510000000.01099.005%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024913.93
50000500000020.112
250000400000005017.24


Lucas-Lehmer results:
No L-L results for M1566083


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T21:25:49Oliver KruseGTX-0
25119971321
7E2FFEF8163882__no
2017-10-31T03:24:32kkmrkkblmbrbkc4.xlarge
25119971321
7E2FFEF8163882__no
2017-12-04T11:13:52kkmrkkblmbrbkc4.xlarge
25119971321
764413643190076582039
B38A3262E7FB27__no
2017-12-04T11:24:14ATHec2-1xf
25119971321
764413643190076582039
B38A3262E7FB27__no
2017-12-04T22:00:37YarBerManual testing
25119971321
764413643190076582039
B38A3262E7FB27__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
1011
1012
1013
1014
TF factor-bounds graph:
267
230
240
250
260
270
280
290
2100
Last modified: 2022-05-12T09:16:55+00:00