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  2  1  1  1  1  1  1  1  2  1  1  1  2  2  1  1  1  2  1  2  1  1  1  1  2  1
 0  4  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  0  4  0  4  4  4  0  4  0
 0  0  4  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  0  4  4  0  4  4  0  4  0  0  4  0  0  4  4  0  4  4  4  4  0  0  4  4  0  0
 0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  0  0  0  0  4  4  4  0  4  4  4  0  0  0  4  4  0  0  4  4  0  0  0  4  4  4  0  4  4  4  0  0  4  4
 0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  0  4  4  4  4  0  4  0  4  4  0  0  0  0  4  4  4  4  4  4  0  0  0  0  0  4  4  4  0  4  0  0  0  4  0  4
 0  0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  0  4  0  0  0  0  4  4  0  4  4  4  4  4  0  0  0  0  4  0  0  4  0  0  4  4  0  4  4  4  0  4  4  4  0  0  4  4  4  4  4
 0  0  0  0  0  0  4  0  0  0  0  0  0  0  0  4  4  4  4  4  0  4  4  4  4  0  0  0  0  0  0  4  4  0  4  0  0  0  4  4  0  4  0  4  4  4  4  0  4  0  0  4  4  4  0  4  0  0  4  4  0  0  4  4
 0  0  0  0  0  0  0  4  0  0  0  0  0  0  4  4  4  0  4  4  0  4  4  0  0  0  0  4  4  4  0  4  0  4  0  0  4  0  4  0  0  0  0  4  4  0  4  4  4  4  4  4  0  4  4  4  0  4  0  4  0  4  0  0
 0  0  0  0  0  0  0  0  4  0  0  0  0  0  4  0  4  0  4  0  0  0  4  4  0  0  4  4  0  0  0  4  4  0  4  4  0  4  0  0  4  4  0  0  4  4  0  0  4  4  0  4  0  4  0  0  0  4  0  0  0  4  0  0
 0  0  0  0  0  0  0  0  0  4  0  0  0  4  0  0  4  0  0  4  0  0  0  4  4  0  4  4  4  0  4  0  4  4  4  4  0  0  0  0  0  0  4  0  4  0  4  4  0  0  4  0  4  4  4  4  0  0  4  0  0  0  0  4
 0  0  0  0  0  0  0  0  0  0  4  0  0  4  0  4  0  4  0  0  0  0  4  4  0  4  0  4  4  4  4  0  0  4  0  0  4  4  0  4  0  0  4  0  4  0  4  0  0  0  4  0  0  0  4  0  0  4  4  4  0  0  4  4
 0  0  0  0  0  0  0  0  0  0  0  4  0  4  4  4  0  4  0  4  4  0  4  0  0  4  4  4  0  0  4  4  4  4  0  4  4  4  0  0  4  4  4  0  0  0  4  4  0  4  0  0  4  0  4  0  4  4  0  0  4  4  0  4
 0  0  0  0  0  0  0  0  0  0  0  0  4  4  4  0  0  4  4  4  4  0  4  4  4  4  4  0  4  4  0  4  0  4  4  4  0  0  0  0  0  0  4  0  4  4  0  4  0  4  0  4  0  0  0  4  0  0  4  4  4  4  0  4

generates a code of length 64 over Z8 who´s minimum homogenous weight is 46.

Homogenous weight enumerator: w(x)=1x^0+56x^46+155x^48+232x^50+337x^52+420x^54+470x^56+64x^57+582x^58+448x^59+677x^60+1344x^61+722x^62+2240x^63+17149x^64+2240x^65+811x^66+1344x^67+733x^68+448x^69+620x^70+64x^71+514x^72+383x^74+307x^76+186x^78+107x^80+68x^82+26x^84+12x^86+4x^88+3x^90+1x^114

The gray image is a code over GF(2) with n=256, k=15 and d=92.
This code was found by Heurico 1.16 in 76 seconds.