369
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Number
$369$ (three hundred and sixty-nine) is:
- $3^2 \times 41$
- The number of distinct free octominoes
- The magic constant of a magic square of order $9$, after $1$, $(5)$, $15$, $34$, $65$, $111$, $175$, $260$:
- $369 = \ds \dfrac 1 9 \sum_{k \mathop = 1}^{9^2} k = \dfrac {9 \paren {9^2 + 1} } 2$
Also see
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $35$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $35$