1, 3, 9, 23, 27, 69, 207, 621
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The prime factors are: 3 x 3 x 3 x 23
The positive integer factors of 1863 are: 1, 3, 9, 23, 27, 69, 81, 207, 621, 1863
Infinite. The first 10 are: 321, 642, 963, 1284, 1605, 1926, 2247, 2568, 2889, 3210 . . .
621
The GCF of 621 and 969 is 3. The prime factorization of 621 = 3 x 3 x 3 x 23, The prime factorization of 969 = 3 x 17 x 19 So HCF is 3