Problem:
How many of the first ten numbers of the sequence are prime numbers?
Answer Choices:
A.
B.
C.
D.
E.
Solution:
Note that
and so on. Therefore each number in the sequence can be written as a product of two positive integers, each greater than 1 , so none of the numbers in this sequence is prime.
The problems on this page are the property of the MAA's American Mathematics Competitions