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Magic Multiplications with Digits
See some patterns generated by arithmetic involving numbers whose digits increase, decrease, or are repeated, or by multiples of some digit. Try to figure out why these curious patterns appear.



A. H. Beiler, Recreations in the Theory of Numbers: The Queen of Mathematics Entertains, New York: Dover Publications, 1964.


"Magic Multiplications with Digits" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/MagicMultiplicationsWithDigits/
Contributed by: Enrique Zeleny
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