2791
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Number
$2791$ (two thousand, seven hundred and ninety-one) is:
- The $406$th prime number
- The $31$st centered hexagonal number after $1$, $7$, $19$, $37$, $61$, $91$, $127$, $\ldots$, $1387$, $1519$, $1657$, $1801$, $1951$, $2107$, $2269$, $2437$, $2611$:
- $2791 = \ds 1 + \sum_{k \mathop = 1}^{31 - 1} 6 k = 31^3 - 30^3$