Primitive Perfect Isosceles Right Triangled Square

Title: ___ 17:102AD GHM

Order: 17

Horizontal side: 102 Vertical side: 102

Elements: 4√2, 8, 8√2, 12√2, 13√2, 14√2, 24, 26, 28, 25√2, 36, 26√2, 38, 50, 52, 38√2, 64.

Code: 645 0 38 521 52 102 365 52 66 501 102 102 82 60 58 81 60 66 42 64 62 281 88 66 142 102 52 126 52 50 245 64 38 266 76 26 387 0 38 380 38 38 254 63 13 136 63 13 265 76 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)