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209 (number)

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209 (number)

208 209 210
Cardinal two hundred nine
Ordinal 209th
(two hundred and ninth)
Factorization 11 × 19
Roman numeral CCIX
Binary 110100012
Ternary 212023
Quaternary 31014
Quinary 13145
Senary 5456
Octal 3218
Duodecimal 15512
Hexadecimal D116
Vigesimal A920
Base 36 5T36

209 (two hundred [and] nine) is the natural number following 208 and preceding 210.

In mathematics

There are 209 spanning trees in a 2 × 5 grid graph,[1] and 209 partial permutations on four elements.[2]

See also

References

  1. ^ "Sloane's A001353 : a(n) = 4*a(n-1) - a(n-2) with a(0) = 0, a(1) = 1", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. ^ "Sloane's A002720 : Number of partial permutations of an n-set; number of n X n binary matrices with at most one 1 in each row and column", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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