3160

Number
$3160$ (three thousand, one hundred and sixty) is:


 * $2^3 \times 5 \times 79$


 * The $40$th hexagonal number after $1$, $6$, $15$, $28$, $45$, $66$, $91$, $\ldots$, $2145$, $2278$, $2415$, $2556$, $2701$, $2850$, $3003$:
 * $3160 = \displaystyle \sum_{k \mathop = 1}^{40} \paren {4 k - 3} = 40 \paren {2 \times 40 - 1}$


 * The $79$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $2701$, $2775$, $2850$, $2926$, $3003$, $3081$:
 * $3160 = \displaystyle \sum_{k \mathop = 1}^{79} k = \dfrac {79 \times \paren {79 + 1} } 2$