205_(number)

205 (number)

205 (number)

Natural number

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

Quick Facts ← 204 205 206 →, Cardinal ...

In mathematics

205 is a lucky number,[1] and a Wolstenholme number.[2] On an infinite chessboard, a knight can reach exactly 205 squares within four moves.[3] There are 205 different ways of forming a connected graph by adding six edges to a set of five labeled vertices.[4]

In other fields

See also

References

  1. [1]
    Sloane, N. J. A. (ed.). "Sequence A000959 (Lucky numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. [2]
    Sloane, N. J. A. (ed.). "Sequence A007406 (Wolstenholme numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. [3]
    Sloane, N. J. A. (ed.). "Sequence A018836 (Number of squares on infinite chess-board at <= n knight's moves from a fixed square)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  4. [4]
    Sloane, N. J. A. (ed.). "Sequence A061540 (Number of connected labeled graphs with n nodes and n+1 edges)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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