Calculate a Two-Dimensional Primitive Root Diffuser

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A list of example prime numbers, a primitive root PR and possible grid sizes (number of columns and rows, either way).

P PR aspect ratio grid size ([number of columns] x [number of rows])
241 7 1.1 16 x 15 (not 24 x 10 because they have a common prime factor other than 1, which is 2)
307 5 1.1 18 x 17
523 2 1.6 29 x 18
547 2 1.2 26 x 21
571 3 1.6 30 x 19
661 2 1.6 33 x 20
701 2 1.1 28 x 25
757 2 1.0 27 x 28
821 2 2.1 40 x 21
829 2 1.6 36 x 23
859 2 1.3 33 x 26
929 3 1.1 32 x 29
947 2 2.0 43 x 22
967 5 1.8 42 x 23
1093 5 1.4 39 x 28
1103 5 1.3 38 x 29
1117 2 1.2 36 x 31
1151 17 1.8 46 x 25
1613 3 1.7 52 x 31
1871 14 1.6 55 x 34
2221 2 1.6 60 x 37
2243 2 1.6 59 x 38
3067 2 1.7 73 x 42
3079 6 2.1 81 x 38
3137 3 1.3 64 x 49
3301 6 1.7 75 x 44
3511 7 1.2 65 x 54
3571 2 1.4 70 x 51
4241 3 1.5 80 x 53
4421 3 1.6 85 x 52
4663 3 1.2 74 x 63
4759 3 1.3 78 x 61
5281 7 1.7 96 x 55
5701 2 1.0 76 x 75
5953 7 1.5 93 x 64
6143 5 1.1 83 x 74
6481 7 1.0 81 x 80
6679 7 1.7 106 x 63
6763 2 1.4 98 x 69
6841 22 1.3 95 x 72
7211 2 1.5 103 x 70
7321 7 2.0 120 x 61
7417 5 1.4 103 x 72
8513 5 2.1 133 x 64
8933 2 1.5 116 x 77
9203 2 1.2 107 x 86
9901 2 1.0 100 x 99
10009 11 1.9 139 x 72
10273 10 1.1 107 x 96
10957 5 1.6 132 x 83
11447 5 1.2 118 x 97
11677 2 1.7 139 x 84
11779 2 1.9 151 x 78
11939 2 1.4 127 x 94
12251 2 1.4 127 x 94
12391 26 1.1 118 x 105
12641 3 2.0 160 x 79