The Hitchhiker's Guide to the Galaxy (novel) productions in the late 1970s. Davies himself appears as Prosser. This edition is out of print – Adams bought up many remainder copies and sold them, autographed, on his website. There have been three audiobook recordings of the novel. The first was an abridged edition (), recorded in the mid-1980s by Stephen Moore, best known for playing the voice of Marvin the Paranoid Android in the radio series, LP adaptations and in the TV series. In 1990, Adams himself recorded an unabridged edition for Dove Audiobooks (), later re-released by New Millennium Audio () in the United States and available
Phrases from The Hitchhiker's Guide to the Galaxy Riemann surface with a maximal number of symmetries and as a symmetry of Hyperbolic tiling made up of combinations of triangles with angle angles π/2, π/3, and π/7 . Rumours that mathematicians are grey mice have been disproved, however. The 42 Puzzle is a game devised by Douglas Adams in 1994 for the United States series of "The Hitchhiker's Guide to the Galaxy" books. The puzzle is an illustration consisting of 42 multi-coloured balls, in 7 columns and 6 rows. Douglas Adams has said, In the puzzle the question is unknown, but the answer is already known to be 42.