1, 5, 13, 65.
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1 and 5
It depends on how many numer combinations you are looking for. If you are looking at combinations of any size, the answer is 265 which includes the null combination - the combination of no numbers out of 65.
1, 5, 13, 31, 65, 155, 403, 2015
That's an infinite list.
The factors of 65 are 1, 5, 13, and 65.