Cube Calendar
Posted: Sat Aug 09, 2008 3:59 pmJohn S. Singleton patented the two-cube calendar in 1957/8 in which [unparseable or potentially dangerous latex formula] digits were inscribed on the faces of two cubes. There were cards to display the month, and each day number [unparseable or potentially dangerous latex formula] was shown with the cubes. That is to say, in order to show the first day of the month, one cube has a [unparseable or potentially dangerous latex formula] and the other has a [unparseable or potentially dangerous latex formula]. What are the twelve digits on the two cubes?
From Martin Gardner's Scientific American column.
From Martin Gardner's Scientific American column.