Once Prime, Always PrimeMath brain teasers require computations to solve.
What is the smallest prime number with 3 distinct digits that remains prime no matter which one of its digits is removed?
When you remove a number you get 13, 17, or 37.
When you remove 2 numbers you get 1, 3, or 7. All prime.
See another brain teaser just like this one...
Or, just get a random brain teaser
If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.
Back to Top