The generator matrix

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

generates a code of length 23 over GR(64,4) who´s minimum homogenous weight is 147.

Homogenous weight enumerator: w(x)=1x^0+392x^147+4704x^148+9072x^149+189x^152+448x^154+5488x^155+28224x^156+30240x^157+196x^160+35840x^161+3136x^162+19208x^163+67424x^164+57456x^165+49x^168+7x^176+70x^184

The gray image is a code over GF(8) with n=184, k=6 and d=147.
This code was found by Heurico 1.16 in 3.32 seconds.