1830

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Number

$1830$ (one thousand, eight hundred and thirty) is:

$2 \times 3 \times 5 \times 61$

The $60$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $1326$, $1378$, $1431$, $1485$, $1540$, $1596$, $1653$, $1711$, $1770$:

$1830 = \ds \sum_{k \mathop = 1}^{60} k = \dfrac {60 \times \paren {60 + 1} } 2$

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