Image made with elements from Canva. Let’s go back to grade school—do you remember learning about prime numbers? They’re numbers that can only be divided by themselves and one. So 2, 3, 5, 7, 11, and ...

Find one million consecutive positive numbers, none of which are prime. Ancient math tells us that prime numbers (2, 3, 5, 7, 11, ...,), which have no factors except for 1 and themselves, go on ...

It’s two decimal digits long, it’s prime, it’s a palindrome and it’s the number of players in a football team. Let’s hear it for “legs” eleven! Today’s puzzles reveal interesting properties about the ...