5208

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Number

$5208$ (five thousand, two hundred and eight) is:

$2^3 \times 3 \times 7 \times 31$

The $42$nd octagonal number, after $1$, $8$, $21$, $40$, $65$, $\ldots$, $3008$, $3201$, $3400$, $3605$, $3816$, $4033$, $4256$, $4485$, $4720$, $4961$:

$5208 = \ds \sum_{k \mathop = 1}^{42} \paren {6 k - 5} = 42 \paren {3 \times 42 - 2}$

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