How many positive integers not exceeding 40 are relatively prime to 40?
Note
This is Euler's totient value φ(40). Removing multiples of its prime factors gives φ(40) = 16.
How many positive integers not exceeding 40 are relatively prime to 40?
This is Euler's totient value φ(40). Removing multiples of its prime factors gives φ(40) = 16.