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Primitive Perfect Isosceles Right Triangled Square

Title: __ 19:40AD GHM

Order: 19

Horizontal side: 40 Vertical side: 40

Elements: 1, 2, 2√2, 4, 3√2, 4√2, 6, 7, 5√2, 6√2, 7√2, 12, 14, 11√2, 12√2, 18, 13√2, 22, 20√2.

Code: 225 0 18 204 20 20 143 40 26 46 22 22 75 26 19 74 33 19 136 27 13 26 20 20 45 22 18 17 26 19 36 24 16 67 27 19 185 0 0 124 12 6 123 24 6 27 24 18 52 29 11 110 29 11 64 18 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)

22
20√2
14
4√2
7
7√2
13√2
2√2
4
1
3√2
6
18
12√2
12
2
5√2
11√2
6√2