Find all integers n can be written as n ＝lcm（a,b）+ lcm（b,c）+ lcm（a,c）. where a,b,c are all integer.

Find all integers $n$ that can be written as $n = \textrm{lcm}(a, b) + \textrm{lcm}(b, c) + \textrm{lcm}(c, a)$ where $a$, $b$, $c$ are all integers.