1, 3, 11, 33.
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1, 3, 9, 11, 33, 99.
The two numbers that go into 165 evenly are 1, 3, 5, 11, 15, 33, 55, and 165 .
1, 2, 3, 4, 6, 11, 12, 22, 33, 44, 66, 132
1 and 3
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.