9455
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Number
$9455$ (nine thousand, four hundred and fifty-five) is:
- $5 \times 31 \times 61$
- The $30$th square pyramidal number after $1$, $5$, $14$, $30$, $55$, $\ldots$, $3311$, $3795$, $4324$, $4900$, $5525$, $6201$, $6930$, $7714$, $8555$:
- $9455 = \ds \sum_{k \mathop = 1}^{30} k^2 = \dfrac {30 \paren {30 + 1} \paren {2 \times 30 + 1} } 6$