218

Mertens function (218) = 3, a record high. 218 is nontotient and also noncototient. 218 is the number of inequivalent ways to color the 12 edges of a cube using at most 2 colors, where two colorings are equivalent if they differ only by a rotation of the cube. There are 218 nondegenerate Boolean functions of 3 variables. The number of surface points on a 73 cube.