2015

Number
$2015$ (two thousand and fifteen) is:


 * $5 \times 13 \times 31$


 * The $3$rd Lucas-Carmichael number after $399$, $935$:
 * $\left({5 + 1}\right) \mathrel \backslash \left({2015 + 1}\right)$, $\left({13 + 1}\right) \mathrel \backslash \left({2015 + 1}\right)$, $\left({31 + 1}\right) \mathrel \backslash \left({2015 + 1}\right)$


 * The $3$rd term of the $3$rd triplet of consecutive positive integers all of which are sphenic:
 * $2013 = 3 \times 11 \times 61$, $2014 = 2 \times 19 \times 53$, $2015 = 5 \times 13 \times 31$