205 (number)
205 (two hundred [and] five) is the natural number following 204 and preceding 206.
| ||||
|---|---|---|---|---|
| Cardinal | two hundred five | |||
| Ordinal | 205th (two hundred fifth) | |||
| Factorization | 5 × 41 | |||
| Divisors | 1, 5, 41, 205 | |||
| Greek numeral | ΣΕ´ | |||
| Roman numeral | CCV | |||
| Binary | 110011012 | |||
| Ternary | 211213 | |||
| Senary | 5416 | |||
| Octal | 3158 | |||
| Duodecimal | 15112 | |||
| Hexadecimal | CD16 | |||
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
- The atomic number of an element temporarily called Binilpentium
See also
- List of highways numbered 205
- 205 Martha, a large Main belt asteroid
- 205 Yonge Street, a building in Toronto
- 205 series, a commuter train type in Japan
- Peugeot 205, a French car
- WWE 205 Live, an American professional wrestling program
References
- Sloane, N. J. A. (ed.). "Sequence A000959 (Lucky numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- Sloane, N. J. A. (ed.). "Sequence A007406 (Wolstenholme numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- 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.
- 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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