Math Problem of the Week 7
by Melissa Schmidli
November 14, 2007
A prime number is a positive counting number greater than 1 that has only two factors, 1 and itself. Five is a prime number because it has only two factors, 1 and 5. Twin primes are two prime numbers whose difference is 2. For example, 3 and 5 are a pair of twin primes because 5-3=2. Find the greatest pair of twin primes less than 100.
