翻訳と辞書 
HAKMEM /hak'mem/ MIT AI Memo 239 (February 1972). A legendary collection of neat mathematical and programming hacks contributed by many people at MIT and elsewhere. (The title of the memo really is "HAKMEM", which is a 6letterism for "hacks memo".) Some of them are very useful techniques, powerful theorems, or interesting unsolved problems, but most fall into the category of mathematical and computer trivia. Here is a sampling of the entries (with authors), slightly paraphrased: Item 41 (Gene Salamin): There are exactly 23,000 prime numbers less than 2^18. Item 46 (Rich Schroeppel): The most *probable* suit distribution in bridge hands is 4432, as compared to 4333, which is the most *evenly* distributed. This is because the world likes to have unequal numbers: a thermodynamic effect saying things will not be in the state of lowest energy, but in the state of lowest disordered energy. Item 81 (Rich Schroeppel): Count the magic squares of order 5 (that is, all the 5by5 arrangements
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