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205 (number)

From Wikipedia, the free encyclopedia
Natural number
← 204205 206 →
Cardinaltwo hundred five
Ordinal205th
(two hundred fifth)
Factorization5 × 41
Divisors1, 5, 41, 205
Greek numeralΣΕ´
Roman numeralCCV,ccv
Binary110011012
Ternary211213
Senary5416
Octal3158
Duodecimal15112
HexadecimalCD16

205 (two hundred [and] five) is thenatural number following204 and preceding206.

In mathematics

[edit]

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

References

[edit]
  1. ^Sloane, N. J. A. (ed.)."Sequence A000959 (Lucky numbers)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. ^Sloane, N. J. A. (ed.)."Sequence A007406 (Wolstenholme numbers)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. ^Sloane, N. J. A. (ed.)."Sequence A018836 (Number of squares on infinite chess-board at <= n knight's moves from a fixed square)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  4. ^Sloane, N. J. A. (ed.)."Sequence A061540 (Number of connected labeled graphs with n nodes and n+1 edges)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
0 to 199
200 to 399
400 to 999
1000s and 10,000s
1000s
10,000s
100,000s to 10,000,000,000,000s


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