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  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  7  1  1  1  1  1  1  1  7  1  1  7  1  1  1  1  1  1  1  1  1  1  7  1  1
 0  7  0  0  0  0  0  0  7  7 21  7 21 14 35  7 14 14 28 42 42 14 14 35 14 21  0 14  0 28 42 14 14 28 21 21  7  0 14  7 21 21 35 14 28 14 28 35 42  7 14 21 35 28  0 42 42 21  7 28  7 14  0 14 35 42  7  0 28  7 28 42 28 21  7 28 28  0  0 35  0 21  0
 0  0  7  0  0  7  7 28 35 42 14 14 35  7 42  7 21  0 42  7 28 42  0 35 21 35 28 14  0 28  7 28  7  0 42 21 14 35  0 42 14 21 42 35  7 21 42 35 14  0 42  7  7 28 35 21 35 28 42 42 14 42 14  0 35 35  7 35 42 35  7  0 14 28  0  7 21 28 42  0  0 14  0
 0  0  0  7  0 35 28 21 35 28 21 42  0 28 42 35 35 35 35 14  0 42  7 14  0 35  7  0 21 42 21 35 42 42 14 28  7  7 21 35 28 35 42  0 14 35 14  0 28  0 28  7  0 28 42 28  7  7 21  0 35 28 28  7  0 14 14 28 35 28 21  0 42  0 35 14 35 21 28  7  7 35  0
 0  0  0  0  7 35  7 14 14 35 35  0  7 14  0 21 14 42 35 42 14 28 28 14  7 14  7 14 42  7  0 14  0 42 42  0 21 42  7 42  0  0 28  7 21 28 35 42 42 14 14 35 35 42  0 28 35 35  0  0 21 28 35 35 14 14 21 28 42 42 14 14 21 28 42 28 21  7  7 28 21  7  0

generates a code of length 83 over Z49 who´s minimum homogenous weight is 455.

Homogenous weight enumerator: w(x)=1x^0+126x^455+822x^462+1398x^469+42x^474+1626x^476+1008x^481+1842x^483+9072x^488+1860x^490+36288x^495+1818x^497+54432x^502+1518x^504+1614x^511+1356x^518+1086x^525+786x^532+564x^539+264x^546+102x^553+24x^560

The gray image is a code over GF(7) with n=581, k=6 and d=455.
This code was found by Heurico 1.16 in 19.7 seconds.