4495
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Number
$4495$ (four thousand, four hundred and ninety-five) is:
- $5 \times 29 \times 31$
- The $29$th tetrahedral number, after $1$, $4$, $10$, $20$, $35$, $\ldots$, $816$, $969$, $1140$, $1330$, $1540$, $1771$, $2024$, $2300$, $2600$, $2925$, $3276$, $3276$, $4060$:
- $4495 = \ds \sum_{k \mathop = 1}^{29} \frac {k \paren {k + 1} } 2 = \dfrac {29 \paren {29 + 1} \paren {29 + 2} } 6$