The conversation between human and AI assistant.
How many of the first 1200 natural numbers are either prime to 6 or to 15?
Oh, that makes sense. Can you give me an example?
Sure. Let's take the numbers 14 and 25. The prime factors of 14 are 2 and 7, and the prime factors of 25 are 5 and 5. The only common factor of 14 and 25 is 1, so they are prime to each other.