New insight into proving math's million-dollar problem: the Riemann hypothesis (Update)
by Lisa Zyga
phys.org, Quantum Physics
April 07, 2017

Originally Posted by article
Researchers have discovered that the solutions to a famous mathematical function called the Riemann zeta function correspond to the solutions of another, different kind of function that may make it easier to solve one of the biggest problems in mathematics: the Riemann hypothesis. If the results can be rigorously verified, then it would finally prove the Riemann hypothesis, which is worth a $1,000,000 Millennium Prize from the Clay Mathematics Institute.

While the Riemann hypothesis dates back to 1859, for the past 100 years or so mathematicians have been trying to find an operator function like the one discovered here, as it is considered a key step in the proof.

From the Clay Math website: Millennium Problems: Reimann Hypothesis and PDF.