1160

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Number

$1160$ (one thousand, one hundred and sixty) is:

$2^3 \times 5 \times 29$

The $20$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $96$, $133$, $176$, $225$, $280$, $341$, $408$, $481$, $560$, $645$, $736$, $833$, $936$, $1045$:

$1160 = \ds \sum_{k \mathop = 1}^{20} \paren {6 k - 5} = 20 \paren {3 \times 20 - 2}$

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