205 (number)
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| ||||
|---|---|---|---|---|
| Cardinal | two hundred and five | |||
| Ordinal |
205th (two hundred and fifth) | |||
| Factorization | 5 · 41 | |||
| Divisors | 1, 5, 41, 205 | |||
| Roman numeral | CCV | |||
| Binary | 110011012 | |||
| Ternary | 211213 | |||
| Quaternary | 30314 | |||
| Quinary | 13105 | |||
| Senary | 5416 | |||
| Octal | 3158 | |||
| Duodecimal | 15112 | |||
| Hexadecimal | CD16 | |||
| Vigesimal | A520 | |||
| Base 36 | 5P36 | |||
205 is the natural number following 204 and preceding 206. It may be written as "two hundred five" or "two hundred and five".
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]
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
References
- ↑ "Sloane's A000959 : Lucky numbers", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A007406 : Wolstenholme numbers", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's 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's 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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