Novel with math plot

I somehow missed this book:

The plot centers on a Sri Lankan mathematician who, dissatisfied with Andrew Wiles's proof of Fermat's Last Theorem, comes up with his own, simpler proof. But then the mathematician takes a back seat in the story as a group dedicated to stopping wars takes center stage and an alien armada threatens to attack Earth. "Disappointingly, the disparate plot threads never mesh," the review says.

Maybe they will mesh in a sequel.