Sorted edges (pairs of vertices a and b with a < b) on an icosahedron.
1, 2, 1, 3, 1, 4, 1, 8, 1, 9, 2, 3, 2, 4, 2, 5, 2, 6, 3, 6, 3, 7, 3, 8, 4, 5, 4, 9, 4, 10, 5, 6, 5, 10, 5, 11, 6, 7, 6, 11, 7, 8, 7, 11, 7, 12, 8, 9, 8, 12, 9, 10, 9, 12, 10, 11, 10, 12, 11, 12
1
The vertices are labeled 1 to 12. Each edge appears only once.
T. D. Noe, Plot of 30 pairs
T. D. Noe, Points on an icosahedron
Eric W. Weisstein, MathWorld: Icosahedron
nonn,full
T. D. Noe, Jan 29 2016