1 and 11.
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1, 3, 11, 33.
1, 3, 9, 11, 33, 99.
No, but these numbers can: 1, 2, 11, 22, 121, 242.
These are all the whole numbers that go into 1,265 evenly: 1, 5, 11, 23, 55, 115, 253, 1265.
The two numbers that go into 165 evenly are 1, 3, 5, 11, 15, 33, 55, and 165 .