They are: 1 and 17
The common factors of 187 and 221 are 1 and 17
The factors of 153 are 1, 3, 9, 17, 51, 153. For them to be common, they need to be compared to another set of factors.
Common factors of 102 and 153 are: 1, 3, 17, and 51.
The factors of 1989 are: 1, 3, 9, 13, 17, 39, 51, 117, 153, 221, 663, 1989.
221
They are 1 and 17
Factors for 442: 1, 2, 13, 17, 26, 34, 221, 442 Factors for 663: 1, 3, 13, 17, 39, 51, 221, 663 Common Factors: 1, 13, 17, 221
{1, 17}
1, 3, 9, 13, 17, 39, 51, 117, 153, 221, 663, 1989 3, 13 and 17 are prime.
The prime factors of 221 are 13 and 17. 13 x 17 = 221. The factors of 221 are 1, 13, 17, and 221.
The factors of 221 are 1, 13, 17, and 221.
There cannot be common factors of just one number. To be common there need to be at least two numbers.