7021

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Number

$7021$ (seven thousand and twenty-one) is:

$7 \times 17 \times 59$

The $118$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $5995$, $6105$, $6216$, $6328$, $6441$, $6555$, $6670$, $6786$, $6903$:

$7021 = \ds \sum_{k \mathop = 1}^{118} k = \dfrac {118 \times \paren {118 + 1} } 2$

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