The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  5  1  1  1  1  1  1  1  1  1  1  1  1  1  5  1  1
 0  5  0  0  0  0  0  5  5 20 10 15 20 15 15 15 10 10  0  0 10 10 15 15 10 10 10  0  0 10 15 20 15 15  0 10 15 20  5 10 15 20 20 20 20 10  5 20  5 10 20 10 15  0 15 20  0  0 10  0 15 20 10  5  5  0  5  5  0  5 20 15  5  5  5 20  5 10  5 15  0 15 15  5 15 10  5 15  5 15  0
 0  0  5  0  0  5  5 15 20 15  0  5 10 10 20  0 20  5  5  0  5 15  5 15 20  0 10 10 10  5 20 20  5 15 15 20 10 20  5  0  0 20  5  0  5 15 20  0  0 20  0  5 10 20 15 20 15  0 20 10 10  5 10  0  0 10  5 20 15 20  5 15 15 15  0 15 15 15 10 15 15  0 10  0 15 15  0 20 15 15  0
 0  0  0  5  0 15 10 15  5  5 20  5  0  5 10  5  5 10 15 10  5  0  5 20 15 10 20 10 15 10 10 20  0 10 15  0 10 15  0  5  5 15 10 20 15  5 20  5 20 10 10 15 15 15 10 20 15  0 10  5 10  0 10 20 15  0 15  0  5  5 10 15  0  0  0 20  5  5 15 10 10  0  5  5  0 15 20 15 15  0  0
 0  0  0  0  5 15  5 20 15  5 15 20 10  0  0  5  0 15 10  5  5 20  5 10  0 20  0 20  5 20  5 10 20 15 10 10 20 15 20 20 20  5 20 20  5 20  5  5 15 10 20 15 10  5  5  5 20 15 15 20  0 15  0  5  0 10  0  0 20 10  5 15  0  5  5 10  5  0 20 10  0  0 20  0  5 15 20 20  5 15 10

generates a code of length 91 over Z25 who´s minimum homogenous weight is 340.

Homogenous weight enumerator: w(x)=1x^0+116x^340+380x^345+496x^350+428x^355+500x^356+340x^360+4000x^361+284x^365+8000x^366+232x^370+220x^375+124x^380+136x^385+92x^390+60x^395+64x^400+68x^405+44x^410+28x^415+4x^420+4x^425+4x^445

The gray image is a code over GF(5) with n=455, k=6 and d=340.
This code was found by Heurico 1.16 in 1.64 seconds.