736

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Number

$736$ (seven hundred and thirty-six) is:

$2^5 \times 23$

The $16$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $96$, $133$, $176$, $225$, $280$, $341$, $408$, $481$, $560$, $645$:

$736 = \ds \sum_{k \mathop = 1}^{16} \paren {6 k - 5} = 16 \paren {3 \times 16 - 2}$

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