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Every one of those numbers is evenly divisible by ' 1 ' and by itself, and 153 of them are also evenly divisible by other additional factors as well, too.
There are six such numbers: 153, 162, 171, 180, 189, 198.
1, 3, 9, 17, 51, 131, 153, 393, 1179, 2227, 6681, 20043
108, 117, 126, 135, 144, 153, 162, 171.
All numbers are divisible by 1.