Tau numbers, natural density, and Hardy and Wright's theorem 437

Robert E. Kennedy, Curtis N. Cooper
1990 International Journal of Mathematics and Mathematical Sciences  
An element of the setT={n:τ(n)is a factor ofn} is called a Tau number, whereτ(n)denotes the number of divisors of the integern. We determine the natural density of this set by use of Hardy and Wright's Theorem 437 (4th ed.).
doi:10.1155/s0161171290000576 fatcat:4hsr5tvrbjgrjnncmr7l5inuly