8555

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Number

$8555$ (eight thousand, five hundred and fifty-five) is:

$5 \times 29 \times 59$

The $29$th square pyramidal number after $1$, $5$, $14$, $30$, $55$, $\ldots$, $3311$, $3795$, $4324$, $4900$, $5525$, $6201$, $6930$, $7714$:

$8555 = \ds \sum_{k \mathop = 1}^{29} k^2 = \dfrac {29 \paren {29 + 1} \paren {2 \times 29 + 1} } 6$

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