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Start with a number, say 39. Add its digits () and repeat. This process, called digitaddition, quickly produces fixed points. An extension to this idea, called n-digitaddition, raises each digit to a power before adding them together. For instance, the 2-digitaddition sequence of 39 is , and so on.

Contributed by: Rob Morris (March 2011)
Open content licensed under CC BY-NC-SA



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