How many positive integers not exceeding 72 are relatively prime to 72?
Note
This is Euler's totient value φ(72). Removing multiples of its prime factors gives φ(72) = 24.
How many positive integers not exceeding 72 are relatively prime to 72?
This is Euler's totient value φ(72). Removing multiples of its prime factors gives φ(72) = 24.