is 2 1855697 - 1
has 558621 decimal digits
takes 0.101 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
Actual26716.012368.6567%500000150000000.10155.0771%16.113770.2480%1.5913%
PrimeNet2570.010363.1579%90001600000.00143.0248%0.011764.2723%1.1144%
GPU722610.165565.5738%90001500000.00131.6320%0.166866.1356%0.5618%
Difference+6+15.8467+3.0829%+491000+14850000+0.1002+3.4451%+15.9469+4.1124%+4.1124%

Known prime factors (2 factors, 132.3 bits, 0.00712878% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18556971382323238582958711856.94037245391855
5 × 7 × 1489 × 714677
-14897146770.00580.00320.0057
1855697481071720243001356601132375.34912962022362567848
23 × 149 × 10874179834369
2021-06-08149108741798343695,594.446,60487,043

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1855697664996618316980731545607653431384729342340132.289
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:36:22alpertronManual testing5000001500000012-
skipped known factor: 138232323858295871
--0.101--5.077%


Trial Factoring results:
No TF results for M1855697


ECM factoring results:

Old Calculation Method

Total ECM effort:19.565 GHz-days
Estimated T-Level:24.554
DigitsB1CurvesCompleteFacMiss
2011000255 / 1002.5507.709%
2550000255 / 2800.91140.158%

New Calculation Method

Total ECM effort:19.565 GHz-days
Estimated T-Level:24.554
DigitsB1CompleteFacMiss
20110008.7110.016%
25500000.78945.424%
302500000.04995.236%
3510000000.00299.776%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.283
50000500000040.277
50000660000021817.01


Lucas-Lehmer results:
No L-L results for M1855697


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T07:32:56Oliver KruseGTX-2
138232323858295871
AA0D30028684CF__no
2017-11-07T04:27:42kkmrkkblmbrbkc4.xlarge
138232323858295871
AA0D30028684CF__no
2021-06-08T13:32:02mrhlanai
138232323858295871
48107172024300135660113
15631DA9A0857F43no


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
109
1010
1011
1012
1013
1014
TF factor-bounds graph:
267
250
260
270
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290
2100
Last modified: 2021-07-23T11:17:09+00:00