Ruby Beginner question:<BR><BR>Is there anyway I can determine whether a variable is a number or not? I understand in Ruby that you can convert variables to Integers by using the ".to_i" method. But ...

Prime numbers have fascinated mathematicians for centuries, yet many students find them intimidating. Whether you're preparing for competitive exams like JEE, solving number theory problems, or simply ...

Is 170,141,183,460,469,231,731,687,303,715,884,105,727 prime? Before you ask the Internet for an answer, can you consider how you might answer that question without a ...

In this thread I had some naive questions about Goldbach's conjecture. Since that thread I've read more of How To Prove It, and was wondering if there was a universally agreed upon definition of a ...