bg-counting Published 11 March 2016 at 1050 × 450 in You can count on Dirichlet ← Previous The divisors of the integers. Banner for James’s Dirichlet counting article Jigsaw Jigsaw is a talented chess player and fervent climber. All articles by Jigsaw More from ChalkdustNEW! Pop-math book clubDo you have lots of unread pop math books on your shelves? Join our new monthly online book club!Things to makePlatonic shapes from tube maps, flexagons, and more mathematical craftWhat’s hot and what’s notOptimal Pac-ManGhostbusting with graph theoryReinventing 2DWhat a difference a matrix makesYour social networksHow similar are you to your friends?