465

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Number

$465$ (four hundred and sixty-five) is:

$3 \times 5 \times 31$

The $30$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $325$, $351$, $378$, $406$, $435$:

$465 = \ds \sum_{k \mathop = 1}^{30} k = \dfrac {30 \times \paren {30 + 1} } 2$

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