Primitive Perfect Isosceles Right Triangled Square

Title: _ 20:138AN3of4 GHM

Order: 20

Horizontal side: 138 Vertical side: 138

Elements: 4, 4√2, 6, 8, 8√2, 12, 12√2, 17, 14√2, 23, 17√2, 20√2, 26√2, 40, 46, 52, 46√2, 49√2, 92, 69√2.

Code: 925 0 46 694 69 69 496 89 89 200 89 89 231 92 69 177 92 69 170 109 69 67 92 52 523 98 0 262 124 26 124 110 40 40 122 52 41 126 52 125 126 40 80 118 48 81 126 48 465 0 0 464 46 0 144 124 26 403 138 0

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

• c = crossed. There is a tile-corner traversed by two lines. The only known crossed PPIRTS's below order 20 are 19:35AB1of4 and 19:35AB4of4.
• d = double-pentagon patterned. Every such tiling is a subdivision of an instance of the same deformable tiling by two 45-90-90-90-225 pentagons with a shared side, four triangles and two pseudotriangles. All below order 19 are degenerate in the sense that one or more sides of underlying tiles have shrunk to zero length. The non-degenerate d-tilings of order 19 are 19:221AA, 19:229AB and 19:241AA.
• e = elegant. No tile-corner is just a T-junction. Such tilings may be considered aesthetically pleasing. The only known elegant PPIRTS's below order 16 are 13:21AA, 14:26AJ, 14:35AA and 15:55AA.
• i = isomers exist which are ineligible for this catalogue. They are not included in the isomer count which follows 'of' in the tiling id.
• r = rectangular inclusion. The only known PPIRTS's below order 16 with a rectangular inclusion are 13:18AA1-4of4 and 15:44AA1-4of4.

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)