1918
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Number
$1918$ (one thousand, nine hundred and eighteen) is:
- $2 \times 7 \times 137$
- The $28$th heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $\ldots$, $874$, $970$, $1071$, $1177$, $1288$, $1404$, $1525$, $1651$, $1782$:
- $\ds 1918 = \sum_{k \mathop = 1}^{28} \paren {5 k - 4} = \dfrac {28 \paren {5 \times 28 - 3} } 2$