2296

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Number

$2296$ (two thousand, two hundred and ninety-six) is:

$2^3 \times 7 \times 41$

The $28$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $\ldots$, $645$, $736$, $833$, $936$, $1045$, $1160$, $1281$, $1408$, $1541$, $1680$, $1825$, $1976$, $2133$:

$2296 = \ds \sum_{k \mathop = 1}^{28} \paren {6 k - 5} = 28 \paren {3 \times 28 - 2}$

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