RATS Sequences

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Take a number, reverse its digits, add that to the original, and then sort the digits. Repeating this produces what is known as a RATS sequence (Reverse Add Then Sort). John Conway conjectured that such a sequence eventually cycles or becomes a divergent period-two pattern.
Contributed by: Rob Morris (March 2011)
Open content licensed under CC BY-NC-SA
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"RATS Sequences"
http://demonstrations.wolfram.com/RATSSequences/
Wolfram Demonstrations Project
Published: March 7 2011