is 2 2455471 - 1
has 739171 decimal digits
takes 0.170 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26712.101167.1642 %2000000600000000.51907.6331 %12.620169.6706 %
Target2630.650065.0794 %100008000000.00531.3340 %0.655365.5452 %
Difference+4+11.4511+2.0848 %+1990000+59200000+0.5136+6.2992%+11.9647+4.1254 %

Known prime factors (2 factors, 110.4 bits, 0.00449481% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24554716864153085831131549.286139772636
22 × 5483 × 6373
-548363735.550e-50.00060.0011
245547124418377313011788571961.083497223899468
22 × 31 × 4009870157
2016-03-313140098701570.208221.97241.038

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2018-09-28alpertronManual testing20000006000000012
skipped known factor: 686415308583113
---10.547%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2016-03-31TJAOIManual testing261262*
61.083
19
0.010


ECM factoring results:
Total ECM effort:22.570 GHz-days
Estimated T-Level:21.261
DigitsB1CompleteFacMiss
20110002.6157.314%
25500000.25277.707%
302500000.01698.383%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.275
50000450334505022.30


Lucas-Lehmer results:
No L-L results for M2455471


PRP results:
dateuseridcompidcofactorsres64
2017-10-13Oliver KruseGTX-2
686415308583113
2441837731301178857
0505A7A1377DDF38
2017-11-28kkmrkkblmbrbkc4.xlarge
686415308583113
2441837731301178857
0505A7A1377DDF38


CERT results:
No CERT results for M2455471


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=21.26 ~= 54-bit
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00