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Primitive Perfect Isosceles Right Triangled Square

Title: __ 18:40AF GHM

Order: 18

Horizontal side: 40 Vertical side: 40

Elements: 1√2, 2, 2√2, 4√2, 6, 5√2, 8, 6√2, 9, 8√2, 12, 9√2, 10√2, 16, 12√2, 19, 16√2, 20√2.

Code: 202 20 20 191 19 40 97 19 40 96 19 31 122 40 28 121 40 40 52 24 26 106 30 18 40 24 26 16 19 21 27 20 22 60 22 22 61 28 22 20 30 18 160 16 16 161 32 16 82 40 8 83 40 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)

20√2
19
9
9√2
12√2
12
5√2
10√2
4√2
1√2
2
6√2
6
2√2
16√2
16
8√2
8