(1) normal matrix
272     138     341     131     151
366     199     130     320     18
226     245     91      245     226
18      320     130     199     366
151     131     341     138     272


original matrix with non-primes marked with x
x272     x138     x341     131     151
x366     199     x130     x320     x18
x226     x245     x91      x245     x226
x18      x320     x130     199     x366
151     131     x341     x138     x272

(2) matrix with non-primes replaced by phi(n)
128      44    150     131     151
120     199     48     128       6
112     168     72     168     112
  6     128     48     199     120
151     131    150      44     128


original matrix with non-primes and no totient of a prime marked with x
x272     138     x341     131     151
366     199     130     x320     18
226     x245     x91      x245     226
18      x320     130     199     366
151     131     x341     138     x272


(3) matrix with non-primes and not a totient of a prime replaced by their totient
128     138     300     131     151
366     199     130     128      18
226     168      72     168     226
 18     128     130     199     366
151     131     300     138     128

matrixModularInverse29 of numbe 3? not sure
       4              2              2             27             28
       8             27             14             18              8
       4             11             20             11              4
       8             18             14             27              8
      28             27              2              2              4