There cannot be a common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
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The factors of 133 are 1, 7, 19, 133
For them to be common, they need to be compared to another set of factors.
The common factors are: 1, 19.
The GCF is 1.
Factors of 133: 1, 7, 19, 133.Factors of 304: 1, 2, 4, 8, 16, 19, 38, 76, 152, 304.GCF (133, 304) = 19
The factors of 266 are: 1, 2, 7, 14, 19, 38, 133, 266The factors of 399 are: 1, 3, 7, 19, 21, 57, 133, 399The common factors are: 1, 7, 19, 133The Greatest Common Factor (GCF) is: 133
The GCF is 7.