Question

So here is my question I want to figure out how many groups of 10 there are in the prime numbers from 2-67 and how many groups of 10 there are in the the numbers that are only divisible by 3 from 6-69. No numbers that create a remainder should be used so it is just 6,9,12,15,18...till 69. Please help me my math sucks. How would I formulate this to get the answer in an exell worksheet. Thank you so much for your help. Andrea