833

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Number

$833$ (eight hundred and thirty-three) is:

$7^2 \times 17$

The $17$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $96$, $133$, $176$, $225$, $280$, $341$, $408$, $481$, $560$, $645$, $736$:

$833 = \ds \sum_{k \mathop = 1}^{17} \paren {6 k - 5} = 17 \paren {3 \times 17 - 2}$

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