There are six: 1 5 25 29 145 725.
1, 5, 25, 29, 145, 725
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
1,3,5,9,15,45
There are six: 1 5 25 29 145 725.
1, 5, 25, 29, 145, 725
no numbers!
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
Itself and any multiples of 725
The numbers that go into 30 are1, 2, 3, 5, 30, 15, 10, 6
60.5
1,2,3,6,7
11,6,1,2,33
n
2,4,7
1,2,4,8,16,32