369_(number)

369 (number)

369 (number)

Natural number

369 (three hundred [and] sixty-nine) is the natural number following 368 and preceding 370.

Quick Facts ← 368 369 370 →, Cardinal ...

In mathematics

369 is the magic constant of the 9 × 9 magic square[1][2] and the n-Queens Problem for n = 9.[2]

There are 369 free octominoes (polyominoes of order 8).[3][4]

369 is a Ruth-Aaron Pair with 370. The sums of their prime factors are equivalent.[5]

References

  1. [1]
    Kraitchik, M (1942). "Magic Squares". Mathematical Recreations. New York: Norton. pp. 142–192.
  2. [2]
    Sequence A006003 in OEIS.
  3. [3]
    Redelmeier, D. Hugh (1981). "Counting polyominoes: yet another attack". Discrete Mathematics. 36 (2): 191–203. doi:10.1016/0012-365X(81)90237-5.
  4. [4]
    Sequence A000105 in OEIS.
  5. [5]
    "Ruth-Aaron Pair". mathworld.wolfram.com.
Share this article:

This article uses material from the Wikipedia article 369_(number), and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.