The conversation between human and AI assistant.
How many of the first 1200 natural numbers are either prime to 6 or to 15?
Can you tell me how many of the first 1200 natural numbers are either prime to 6 or to 15?
Sure. The numbers prime to 6 are 1, 5, 7, 11, 13, 17, 19... and the ones prime to 15 are 1, 2, 4, 7, 8, 11, 13... There are 624 numbers that are prime to 6 or to 15 among the first 1200 natural numbers.