is 2 2554553 - 1
has 768998 decimal digits
takes 0.177 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
Actual26711.631767.1642 %2000000600000000.51907.6641 %12.150769.6808 %
Target2630.624865.0794 %120009000000.00611.4785 %0.630865.5957 %
Difference+4+11.0070+2.0848 %+1988000+59100000+0.5129+6.1856%+11.5199+4.0851 %

Known prime factors (2 factors, 125.4 bits, 0.00490728% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2554553100883998347531443.1981974592
26 × 30853
-64308536.426e-70.00020.0003
255455354081068039380648967728492582.1611058523116165150008
23 × 38321 × 3452816719831
2018-03-19383213452816719831510,23118,92035,337

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2019-07-04alpertronManual testing20000006000000012
skipped known factor: 10088399834753
---10.586%


Trial Factoring results:
5758596061626364656667
No TF results for M2554553


ECM factoring results:
Total ECM effort:2.834 GHz-days
Estimated T-Level:20.517
DigitsB1CompleteFacMiss
20110001.10932.990%
25500000.10390.177%
302500000.00799.345%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.277
50000500000020.184
500007000000222.373


Lucas-Lehmer results:
No L-L results for M2554553


PRP results:
dateuseridcompidcofactorsres64
2017-10-16kkmrkkblmbrbkc4.xlarge
10088399834753
9379B0538DCF8DBC
2017-11-11Oliver KruseGTX-3
10088399834753
9379B0538DCF8DBC
2018-03-22ANONYMOUS
10088399834753
5408106803938064896772849
9379B0538DCF8DBC


CERT results:
No CERT results for M2554553


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
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1010
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TF factor-bounds graph:
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=20.52 ~= 52-bit
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Last modified: 2024-03-17T01:24:37+00:00