is 2 1778879 - 1
has 535496 decimal digits
takes 0.097 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
Actual26716.703768.6567 %500000150000000.10155.0513 %16.805270.2400 %
Target2610.172765.5738 %80006500000.00341.4914 %0.176166.0872 %
Difference+6+16.5310+3.0829 %+492000+14350000+0.0981+3.5598%+16.6291+4.1527 %

Known prime factors (2 factors, 122.1 bits, 0.00686146% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
177887912980237744102631650.205364843189
364843189
-13648431890.00011.56362.9204
177887942616952551758491099032271.8521197859791243769
19289 × 62100668321
2020-09-261928962100668321463.64266.15497.09

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012---8.838%


Trial Factoring results:
5758596061626364656667
No TF results for M1778879


ECM factoring results:
Total ECM effort:38.421 GHz-days
Estimated T-Level:25.712
DigitsB1CompleteFacMiss
201100014.8380.000%
25500001.67918.659%
302500000.14286.731%
3510000000.01099.024%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025817.76
50000500000030.207
250000400000004820.45


Lucas-Lehmer results:
No L-L results for M1778879


PRP results:
dateuseridcompidcofactorsres64
2017-10-03Oliver KruseGTX-1
1298023774410263
CC1728879D7BD31E
2017-11-10kkmrkkblmbrbkc4.xlarge
1298023774410263
CC1728879D7BD31E
2020-09-27xyuzyzvj20a
1298023774410263
4261695255175849109903
B39CE7286B76A65D
2020-09-28LOBESAWS
1298023774410263
4261695255175849109903
B39CE7286B76A65D


CERT results:
No CERT results for M1778879


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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101
102
103
104
105
106
100
101
102
103
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105
106
107
108
109
1010
1011
TF factor-bounds graph:
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00