Ask HN: Are there any number or math based multiplayer board games?

Sometimes we have friends over for a couple games of Scrabble. One of my friends said that it would be more fun if there was a way to play with numbers instead of letters. It got us talking about creating some kind of multiplayer number puzzle game, maybe like a cross between Sudoku and Scrabble. Surely someone has had this idea before. Has anyone played a board game like this?