The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  1  1  1  1  1
 0  1 2a^2+3  a 3a^2+2 2a^2+3a+1 a^2+3a a^2+3a+3 3a^2+2a+3  2 2a^2+2a+3 a+2 3a^2+2a+2 2a^2+3a+3 a^2+a a^2+3a+1 3a^2+3  1 2a 2a^2+2a+1 3a 3a^2+2a 2a^2+a+1

generates a code of length 23 over GR(64,4) who´s minimum homogenous weight is 155.

Homogenous weight enumerator: w(x)=1x^0+448x^155+840x^156+35x^160+1344x^163+1400x^164+28x^168

The gray image is a code over GF(8) with n=184, k=4 and d=155.
This code was found by Heurico 1.16 in 0.00222 seconds.