4256

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Number

$4256$ (four thousand, two hundred and fifty-six) is:

$2^5 \times 7 \times 19$

The $38$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $\ldots$, $2296$, $2465$, $2640$, $2821$, $3008$, $3201$, $3400$, $3605$, $3816$, $4033$:

$4256 = \ds \sum_{k \mathop = 1}^{38} \paren {6 k - 5} = 38 \paren {3 \times 38 - 2}$

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