3201

Number
$3201$ (three thousand, two hundred and one) is:


 * $3 \times 11 \times 97$


 * The $33$rd octagonal number, after $1$, $8$, $21$, $40$, $65$, $\ldots$, $1281$, $1408$, $1541$, $1680$, $1825$, $1976$, $2133$, $2296$, $2465$, $2640$, $2821$, $3008$:
 * $3201 = \displaystyle \sum_{k \mathop = 1}^{33} \paren {6 k - 5} = 33 \paren {3 \times 33 - 2}$