2059
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Number
$2059$ (two thousand and fifty-nine) is:
- $29 \times 71$
- The $29$th heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $\ldots$, $874$, $970$, $1071$, $1177$, $1288$, $1404$, $1525$, $1651$, $1782$, $1918$:
- $2059 = \ds \sum_{k \mathop = 1}^{29} \paren {5 k - 4} = \dfrac {29 \paren {5 \times 29 - 3} } 2$