23 is prime. Prime numbers don't have proper factors.
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The factors of 138 are 1, 2, 3, 6, 23, 46, 69, and 138
The common factors are: 1, 23.
The factors of 17 are: 1, 17 The factors of 23 are: 1, 23 The common factors are: 1 The Greatest Common Factor: 1
the factors of 23 is 1 and 23,which is itself, thus it is also known as a prime number.
1 and 23.