205 (number)

205 (two hundred [and] five) is the natural number following 204 and preceding 206.

In mathematics
205 is a lucky number, and a Wolstenholme number. On an infinite chessboard, a knight can reach exactly 205 squares within four moves. There are 205 different ways of forming a connected graph by adding six edges to a set of five labeled vertices.

In other fields

 * The atomic number of an element temporarily called Binilpentium