Every even negative number...........on the X axis has a zero........................every other..........whole number....whole even.......negative number....................................if u start with 2.........and underline every other prime.......under 100...........there are 13 of them.........


2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97