104 = 2 x 3 x 17
221 = 13 x 17
factors in common : 17
GCF = 17
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A factor is a divisor - a number that will evenly divide into another number. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 169 are 1, 13, and 169. The factors of 14365 are 1, 5, 13, 17, 65, 85, 169, 221, 845, 1105, 2873, and 14365. The common factors are 1, 13, and 169. This would mean that the greatest common factor is 169.
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
13
663 is a composite number because it has factors other than 1 and itself. It is not a prime number.The 8 factors of 663 are 1, 3, 13, 17, 39, 51, 221, and 663.The factor pairs of 663 are 1 x 663, 3 x 221, 13 x 51, and 17 x 39.The proper factors of 663 are 1, 3, 13, 17, 39, 51, and 221 or,if the definition you are using excludes 1, they are 3, 13, 17, 39, 51, and 221.The prime factors of 663 are 3, 13, and 17.The 3 distinct prime factors (listing each prime factor only once) of 663 are 3, 13, and 17.The prime factorization of 663 is 3 x 13 x 17.NOTE: There cannot be common factors, a greatest common factor, or a least common multiple because "common" refers to factors or multiples that two or more numbers have in common.
The factors of 221 are 1, 13, 17, and 221.