prime number chart?????

About a month ago on a blog there was links to different math and home school help.
One of the links was to the neatest 100 chart of finding prime numbers.
Does anyone remember seeing this link or was it on your blog? If so I really
would love to have that link again. I thought I had book marked it but can't find it.
Thank you for any help getting back to this post I once found.