is 2 1557607 - 1
has 468887 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
Actual26719.076668.6567%500000150000000.08354.9710%19.160270.2148%1.5581%
PrimeNet2570.012363.1579%65001100000.00082.4228%0.013164.0505%0.8926%
GPU722610.197265.5738%6500600000.00061.0501%0.197865.9353%0.3615%
Difference+6+18.8794+3.0829%+493500+14940000+0.0829+3.9209%+18.9624+4.2795%+4.2795%

Known prime factors (3 factors, 177.2 bits, 0.01137865% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15576079615326075991239.807308657
257 × 1201
-25712018.505e-81.998e-53.388e-5
15576071418135908825064264232166.94345522904969773
33 × 7 × 11 × 281 × 77923627
2017-12-022817792362710.9210.27500.5136
155760716529844812053318616172270.486530616670702344
23 × 33 × 17 × 2137 × 67619771
2019-07-19213767619771247.910.23870.4457

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
155760713635839183423417583138222418837733106.749
1557607158939847853404295144275103062758334110.292
155760723441566495278506587848400391940062830599142137.428
155760722539830558410493961152372395763142236021849630382
5609
54177.235
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:16:17alpertronManual testing5000001500000012-
skipped known factor: 961532607599
--0.084--4.971%


Trial Factoring results:
No TF results for M1557607


ECM factoring results:

Old Calculation Method

Total ECM effort:31.265 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:31.265 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.67418.740%
302500000.14486.623%
3510000000.01099.005%


ECM Summary

B1B2factorcurvesGHz-days
50000500000020911.69
50000500000030.168
500005000000392.181
250000400000005017.23


Lucas-Lehmer results:
No L-L results for M1557607


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T19:50:56Oliver KruseGTX-2
961532607599
BDDBA4E6984DC3__no
2017-10-30T21:47:05kkmrkkblmbrbkc4.xlarge
961532607599
BDDBA4E6984DC3__no
2017-12-03T09:47:00kkmrkkblmbrbkc4.xlarge
961532607599
141813590882506426423
DD85B4871F8446__no
2017-12-03T10:04:34ATHec2-1xf
961532607599
141813590882506426423
DD85B4871F8446__no
2019-07-19T14:33:55ATHec2-PRPCF
961532607599
141813590882506426423
1652984481205331861617
DD85B4871F844640no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
230
240
250
260
270
280
290
2100
Last modified: 2022-06-16T11:18:31+00:00