205 (number)
| |||
|---|---|---|---|
| Cardinal | two hundred five | ||
| Ordinal | 205th (two hundred fifth) | ||
| Factorization | 5 × 41 | ||
| Divisors | 1, 5, 41, 205 | ||
| Greek numeral | ΣΕ´ | ||
| Roman numeral | CCV, ccv | ||
| Binary | 110011012 | ||
| Ternary | 211213 | ||
| Senary | 5416 | ||
| Octal | 3158 | ||
| Duodecimal | 15112 | ||
| Hexadecimal | CD16 |
205 (two hundred [and] five) is the natural number following 204 and preceding 206.
In mathematics
[edit]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 or less.[3] There are 205 different ways of forming a connected graph by adding six edges to a set of five labeled vertices.[4]
References
[edit]- ^ 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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