Squigly Squigly's Brain Teasers


Which of these numbers are prime numbers: 7, 8, 9, 10, 11, 12, 13, 14?


7, 11, 13.

Try another Brain Teaser:

Every day, a cyclist crosses the border between Spain and France carrying a bag. No matter how much custom officials investigate him, they do not know what he is smuggling. Do you?
