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Joseph Madachy (born 1927) was the lead editor of Journal of Recreational Mathematics for nearly 30 years. He was the initial lead editor from 1968–xx, later in 19xx–1999, and has served as editor emeritus since. Previously he was owner, publisher and editor of the predecessor Recreational Mathematics Magazine which ran during 1961–1964.
He authored the books Mathematics on Vacation, Madachy's Mathematical Recreations and Mathematical Diversions. Longtime colleagues and co-authors include Martin Gardner, Harry Nelson, and Isaac Asimov.
He was a major proponent and supporter of recreational mathematics for decades. He worked with prime numbers and developed mathematical concepts used in applications such as cyber security with cryptography, or at least cryptarithmetic. He made contributions to Narcissistic numbers and Fibonacci series, or at least devised puzzles using Fibonacci numbers.
- "Journal of Recreational Mathematics". baywood.com. Retrieved June 18, 2010.
- Pickover, Clifford A. (2003-12-29). The Zen of Magic Squares, Circles, and Stars: An Exhibition of Surprising Structures Across Dimensions. Princeton University Press. pp. 110–. ISBN 9780691115979. Retrieved 19 June 2012.
- Prime Magic Squares
- Madachy, J. S. "Magic and Antimagic Squares." Ch. 4 in Madachy's Mathematical Recreations. New York: Dover, pp. 85-113, 1979.
- A Primer on Cryptarithmetic
- Joseph S. Madachy, Mathematics on Vacation, Thomas Nelson & Sons Ltd. 1966, pages 163-175
- Narcissistic numbers
- The Fibonacci Quarterly 6 (1). The Fibonacci Association. February 1968. Retrieved 20 June 2012.
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