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Chaos and Fractals *(272) Magic Square (17)
Combinatorial Games *(9) Polyominoes (47)
Competitions (54) Specific Numbers (113)
Famous Problems (19) Tessellations (28)
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A Disproof of Pythagoras' Theorem? - A method of disproving the Theorem of Pythagoras is presented. The author is adamant that this is intended only as a puzzle to find the mistake in the arguments, and not as a serious proposal.
A Primer on Cryptarithmetic - Instructions, examples, references and links.
Alphametics and Cryptarithms - Cryptarithms are puzzles in which letters or symbols are substituted for the digits in an arithmetical calculation. If a cryptarithm utilizes letters in place of the digits, and these letters form sensible words or phrases, the puzzle is termed an alphametic.
Back to Square One - Includes description, solutions and other resources on this cube-like puzzle.
Bamdad's Math Comics - Private collection of comics, cartoons and strips about math.
Bob's Positive Integer Pages - Various articles about positive integers, including an alternative number system that avoids the digit and number zero, a look at number systems and at the concept of zero.
Books and Articles on Mathematical Recreations - Information on list includes titles, authors, publishers and paperback or hardcover.
Challenging Mathematical Problems - Contains algebra, geometry, number theory, inequalities, Combinatorics, probability and analysis problems. Includes hints but no solutions.
Clever Games for Clever People - Games that interest John Conway including Rim and Traffic Jam.
Cryptarithms Online - 70 brain-teasers; a Primer on Cryptarithmetic; books and links to alphametics on the Web.
David Singmaster: List of Available Material - Teaching and recreational items in this personal collection.
Decimal to Hexadecimal Conversion - A table to convert any number from 1 to 255 to Hexadecimal.
EFF Cooperative Computing Awards - Cash prizes for discovery of very large prime numbers.
Ecker - Recreational & Educational Computing, Dr. Michael W. Ecker's Home Page - "REC gets better and better. I would not want to miss a single issue!" Martin Gardner, world-famous recreational mathematics author
Eureka - The annual journal of the Archimedeans, the mathematical society of the University of Cambridge. It regularly contains articles on recreational mathematics.
Fair Dice - Contains a complete list of all possible Fair Dice, most of which are not cubes. Includes pictures.
Famous Curves Index - Curves you've heard of and curves you haven't, from Astroid to the Witch of Agnesi.
Fibonacci Numbers and the Golden section in Nature - Puzzles and things to do, for schools, teachers, colleges up to university level students, or just for recreation.
Fun With Mathematics - Includes pages on the topics of primes, fibonacci numbers, PI computation, data encryption and links to calculator programs.
Gardner Index - Rough index to the fifteen books containing Martin Gardner's Mathematical Games articles from Scientific American.

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