0
Anonymous
1, 2, 3, 5, 6, 10, 15, 30.
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1, 7, 11, 13, 77, 91, 143, 1001.
30 is the smallest one, every multiple of 30 is another one, and they are all equally common.
The number is 1.
1, 2, 5, 10.
1, 2, 3, 5, 6, 10, 15, 30