The generator matrix

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

generates a code of length 64 over GR(64,4) who´s minimum homogenous weight is 437.

Homogenous weight enumerator: w(x)=1x^0+1120x^437+2352x^439+7952x^440+2240x^445+1568x^447+2534x^448+3808x^453+3248x^455+7903x^456+21x^464+21x^472

The gray image is a code over GF(8) with n=512, k=5 and d=437.
This code was found by Heurico 1.16 in 0.255 seconds.