6533

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Number

$6533$ (six thousand, five hundred and thirty-three) is:

$47 \times 139$

The $47$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $\ldots$, $3816$, $4033$, $4256$, $4485$, $4720$, $4961$, $5208$, $5461$, $5720$, $5985$, $6256$:

$6533 = \ds \sum_{k \mathop = 1}^{47} \paren {6 k - 5} = 47 \paren {3 \times 47 - 2}$

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