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|A Friedman number is a number that can be written in some non-trivial way using its digits, the operations + - * / ^ and concatenation of digits. For example, 25 and 126 are Friedman numbers, since 25 = 5^2, and 126 = 6 * 21. Page includes a list of all the Friedman numbers with four or fewer digits; facts about Friedman numbers; and theorems and corollaries, with some proofs.|
|Levels:||High School (9-12), College, Research|
|Math Topics:||Sequences and Sets|
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