In 2004 Kevin Ford established sharp asymptotics on Erdős’ problem on the number of different products a⋅b, a,b∈{1,…,n}.

(http://arxiv.org/abs/math/0401223, see also discussion here: Number of elements in the set {1,⋯,n}⋅{1,⋯,n})

My naive question is whether there are much less different numbers of the form

lcm(a,b), where a,b∈{1,…,n}.

**Answer**

**Attribution***Source : Link , Question Author : Fedor Petrov , Answer Author : Community*