Primitive Perfect Isosceles Right Triangled Square

Title: _ 20:148BH7of8 GHM

Order: 20

Horizontal side: 148 Vertical side: 148

Elements: 4, 4√2, 6, 8, 7√2, 8√2, 12, 14, 12√2, 28, 20√2, 34, 40, 34√2, 54, 40√2, 47√2, 54√2, 94, 74√2.

Code: 945 0 54 744 74 74 346 114 114 403 114 74 345 114 80 67 114 80 126 108 68 287 120 80 406 108 40 204 94 54 143 108 54 82 116 60 83 116 52 42 120 56 43 120 52 545 0 0 544 54 0 76 101 47 127 108 52 470 101 47

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)