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Knuth reward checks are checks awarded by computer scientist Donald Knuth for finding mistakes in, or making suggestions for, his publications. According to MIT Technology Review, "Knuth’s reward checks are among computerdom's most prized trophies".
In the preface of each of his books and on his website, Knuth offers a reward of $2.56 (USD) to the first person to find each error in his published books, whether it be technical, typographical, or historical. Knuth explains that $2.56, or 256 cents, corresponds to one hexadecimal dollar. Valuable suggestions are worth 32 cents. In his earlier books...