Code details
best found code with parameters
q=16 k=3 n=28
minimum distance = 25
 this is new optimal code
the previous bounds were -1/25
this is a projective code
We used the prescribed group of automorphisms with the following generators
This group makes 39 orbits of sizes:
| 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 
The solution of the corresponding linear system of equations was found after less than 500 seconds:
| 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 3 | 2 | 1 | 3 | 0 | 3 | 0 | 0 | 3 | 3 | 1 | 0 | 2 | 1 | 0 | 3 | 2 | 2 | 3 | 2 | 3 | 3 | 1 | 3 | 3 | 3 | 0 | 0 | 1 | 3 | 3 | 1 | 3 | 3 | 1 | 0 | 0 | 
This produces the following generator matrix
| 0 | 15 | 15 | 15 | 15 | 15 | 15 | 0 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 
| 15 | 0 | 5 | 5 | 5 | 10 | 15 | 15 | 0 | 1 | 14 | 3 | 11 | 15 | 14 | 7 | 7 | 7 | 10 | 3 | 12 | 14 | 4 | 2 | 2 | 2 | 10 | 11 | 
| 5 | 10 | 0 | 5 | 10 | 15 | 10 | 11 | 12 | 0 | 15 | 3 | 14 | 4 | 9 | 9 | 3 | 11 | 9 | 5 | 14 | 5 | 8 | 8 | 3 | 12 | 1 | 8 | 
Which is a code with the following weight distribution
1y28+1680x25y3+630x26y2+840x27y1+945x28