Least common multiple count

 Published on Sunday, 8th April 2012, 11:00 am; Solved by 489;
Difficulty rating: 70%

Problem 379

Let f(n) be the number of couples (x,y) with x and y positive integers, xy and the least common multiple of x and y equal to n.

Let g be the summatory function of f, i.e.: g(n) = ∑ f(i) for 1 ≤ in.

You are given that g(106) = 37429395.

Find g(1012).