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The only whole number that can do that is ' 1 '.
It is: 1
1, 2, 17, 34
It is: 7 and 1
1, 3, 7, 9, 21, 63.
The greatest common factor is 63
34
3 goes into 36 and 63 evenly.
One.
1 and 7.
1, 3, 9.
Only the number one.