The generator matrix

 1  0  1
 0  1 36
 0  0 35

generates a code of length 3 over Z49 who´s minimum homogenous weight is 7.

Homogenous weight enumerator: w(x)=1x^0+18x^7+882x^12+108x^14+10290x^18+5292x^19+216x^21

The gray image is a code over GF(7) with n=21, k=5 and d=7.
This code was found by Heurico 1.16 in 0.00106 seconds.