595

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Number

$595$ (five hundred and ninety-five) is:

$5 \times 7 \times 17$

The $8$th palindromic triangular number after $0$, $1$, $3$, $6$, $55$, $66$, $171$.

The $34$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $325$, $351$, $378$, $406$, $435$, $465$, $496$, $528$, $561$:

$595 = \ds \sum_{k \mathop = 1}^{34} k = \dfrac {34 \times \paren {34 + 1} } 2$

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