1, 3, 9, 37, 111 and 333.
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The prime factors of 333 are 3,3 and 37 Thus the pairs of whole numbers that go into 333 are: 1 and 333 3 and 111 9 and 37 There are 3 pairs.
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
1,2,4,8,16,32
255
1,3,5,9,15,45