Mathematicians want to know when a certain function, called the Riemann Zeta function, written ζ(s), equals zero. There are many well known values of s where ζ(s) is zero. They are the negative even integers. The Riemann Hypothesis says that apart from the negative even integers, ζ(s) equals zero only when s is a complex number with real part 1/2 or a negative whole number.