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The greatest common factor of 7 and 243 is 1.

Prime factorizations:

7 = 7

243 = 3 x 3 x 3 x 3

common factors - no primes, so only common factor is 1:

7 x 1 = 7

243 x 1 = 243

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Q: What is the greatest common factor of 7 and 243?
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