How Many Primes
How many different three-digit prime numbers using only the digits 1, 2 and 6 can be made? You may repeat the digits when creating your three-digit primes.
Login to Answer
Elementary Brain Teaser
Fun and accessible problems for younger students or beginners. Posted every Monday, these weekly brain teasers kickstart your week with a mental warm-up.
Login to Answer
Individual Rankings
The first 5 to correctly answer this question are shown below.
View All Individual RankingsLeaderboard Rankings
The 5 top-ranked leaderboards for this question are shown below.
View All Leaderboard Rankings