Enigma 1780: Pure hedronism
18 December 2013
Posted by on
From New Scientist #2948, 21st December 2013 [link]
Joe’s problem for Penny this week was to number each triangle of an icosahedron with one of the digits 1 to 5 so that each of the five triangles meeting at a point was numbered differently. Some of the digits in Penny’s solution are shown in the diagram of an icosahedron dissected and laid flat. Six of the digits are covered with the letters ENIGMA. What are those digits?
New Scientist has announced that this will be the final Enigma puzzle.
I’m a little bit shocked, as I’ve become used to programming solutions to them. Fortunately I’m not quite a third of the way through the archive of all Enigma puzzles, so I’ll be able to keep posting classic puzzles for some time.