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Primitive Perfect Isosceles Right Triangled Square

Title: dr 18:142BN4of4 GHM

Order: 18

Horizontal side: 142 Vertical side: 142

Elements: 6, 6√2, 12, 9√2, 12√2, 18, 20, 18√2, 20√2, 31, 40, 42, 31√2, 51, 71, 51√2, 91, 71√2.

Code: 915 0 51 714 71 71 713 142 71 204 91 51 203 111 51 312 142 40 311 142 71 517 0 51 510 51 51 421 93 51 187 93 51 186 93 33 403 142 0 122 105 21 123 105 9 62 111 15 63 111 9 94 102 0

The properties below may precede order:side in a tiling's title:

Credit for Discovery

Just three people are credited with the discovery of Primitive Perfects:

Geoffrey H. Morley (GHM, England)

Jasper D. Skinner, II (JDS, United States)

William T. Tutte (WTT, Canada, 1917-2002) (15:44AI, 17:136AJ and 19:56AJ only)

91
71√2
71
20√2
20
31√2
31
51
51√2
42
18
18√2
40
12√2
12
6√2
6
9√2