1, 3, 7, 9, 11, 21, 27, 33, 49, 63, 77, 99, 147, 189, 231, 297, 441, 539, 693, 1323, 1617, 2079, 4851, 14553
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Possiblilty is almost 1/2 cause every two numbers is a number with a factor of 2.From 2: 2,3,4,5,6,7,8,9,10...
That's the greatest common factor, or GCF.
Factor both numbers. Select the factors they both have in common. Choose the largest (greatest) one.
The greatest factor of these numbers is the number 6, which is a factor of 6 - though not of the other two numbers.
Any multiple of 19 has 19 as a factor.