Recursive

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Applying a rule or formula to its results (again and again).

Example: start with 1 and apply "double" recursively: 1, 2, 4, 8, 16, 32, ...
(the result of doubling 1 is 2, then take that result of 2 and apply "double" again to get 4, then take the 4 and double it to 8, and so on.)