LCM( 215, 13 ) = 2795
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 215, b = 13 and GCD(215, 13) = 1.
$$ \text{LCM} (215, 13) = \frac{ 215 \cdot 13 }{ \text{GCD}(215,13)} = \frac{ 2795 }{ 1 } = 2795 $$