2015

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


 * $5 \times 13 \times 31$


 * The $3$rd Lucas-Carmichael number after $399$, $935$:
 * $\paren {5 + 1} \divides \paren {2015 + 1}$, $\paren {13 + 1} \divides \paren {2015 + 1}$, $\paren {31 + 1} \divides \paren {2015 + 1}$


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