7260

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Number

$7260$ (seven thousand, two hundred and sixty) is:

$2^2 \times 3 \times 5 \times 11^2$

The $120$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $6786$, $6903$, $7021$, $7140$:

$7260 = \ds \sum_{k \mathop = 1}^{120} k = \dfrac {120 \times \paren {120 + 1} } 2$

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