205 (number)

Short description: Natural number

| <- 204  | 205 |  206 ->

|
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← 200 201 202 203 204 205 206 207 208 209 →

List of numbers — Integers

← 0 100 200 300 400 500 600 700 800 900 →

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
Quaternary| 30314
Quinary| 13105
Senary| 5416
Octal| 3158
Duodecimal| 15112
Hexadecimal| CD16
Vigesimal| A520
Base 36| 5P36

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

## Contents

* 1 In mathematics
* 2 In other fields
* 3 See also
* 4 References

## 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

1. ↑ Sloane, N. J. A., ed. "Sequence A000959 (Lucky numbers)". OEIS Foundation. https://oeis.org/A000959.
2. ↑ Sloane, N. J. A., ed. "Sequence A007406 (Wolstenholme numbers)". OEIS Foundation. https://oeis.org/A007406.
3. ↑ Sloane, N. J. A., ed. "Sequence A018836 (Number of squares on infinite chess-board at <= n knight's moves from a fixed square)". OEIS Foundation. https://oeis.org/A018836.
4. ↑ Sloane, N. J. A., ed. "Sequence A061540 (Number of connected labeled graphs with n nodes and n+1 edges)". OEIS Foundation. https://oeis.org/A061540.

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