Problem #138
Mul Me
Let the number of ordered quadruples satisfying this equation be f(n)
a * b * c * d <=n
f(1)=1
f(2)=5
Find f(10^{12})
Let the number of ordered quadruples satisfying this equation be f(n)
a * b * c * d <=n
f(1)=1
f(2)=5
Find f(10^{12})