Tau numbers, natural density, and Hardy and Wright's theorem 437
Robert E. Kennedy1and Curtis N. Cooper1
Received07 Feb 1989
Revised09 Mar 1989
Abstract
An element of the set T= {n:τ(n) is a factor of n} is called a Tau number, where τ(n) denotes the number of divisors of the integer n. We determine the natural density of this set by use of Hardy and Wright's Theorem 437 (4th ed.).