5671

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Number

$5671$ (five thousand, six hundred and seventy-one) is:

$53 \times 107$

The $106$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $5253$, $5356$, $5460$, $5565$:

$5671 = \ds \sum_{k \mathop = 1}^{106} k = \dfrac {106 \times \paren {106 + 1} } 2$

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