is 2 2783873 - 1
has 838030 decimal digits
takes 0.215 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
Actual26710.673667.1642 %3200002612540701.62807.7568 %12.301669.7112 %
Target2630.573365.0794 %1500012000000.00891.7479 %0.582265.6898 %
Difference+4+10.1003+2.0848 %+305000+260054070+1.6191+6.0089%+11.7193+4.0214 %

Known prime factors (1 factor, 39.9 bits, 0.00143332% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
278387310270709691291339.902184468
22 × 107 × 431
-1074315.073e-81.396e-52.439e-5

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-12-04USAFSSUSAFSACS320000261254070
skipped known factor: 1027070969129
--1.79410.997%


Trial Factoring results:
5758596061626364656667
No TF results for M2783873


ECM factoring results:
Total ECM effort:0.304 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.304


Lucas-Lehmer results:
No L-L results for M2783873


PRP results:
dateuseridcompidcofactorsres64
2017-10-21Oliver KruseGTX-0
1027070969129
02E459984777C1BB
2017-12-06kkmrkkblmbrbkc4.xlarge
1027070969129
02E459984777C1BB


CERT results:
No CERT results for M2783873


P-1 factor-bounds graph:
B1 = 320000, B2 = 261254070 (P-1 stage 2)
B1 = 320000 (P-1 stage 1)
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105
106
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
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Last modified: 2024-03-13T02:15:48+00:00