6 Digit Primes
How many 6-digit primes are of the form ababa(b-1)? (note: a can equal b)
Problem submitted by Pat Costello, Eastern Kentucky University
Login to Answer
Problem of the Week
A new problem every Monday that challenges participants of all ages to think creatively and apply their math skills. Perfect for a weekly mental challenge.
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