1 and 2.
They are: 1, 2, 4, 8, 16, 32, 64, 128, 256.
no numbers!
1 can, 2 can, and there are 7 more (including 256).
All these numbers go into 768 evenly: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 256, 384, 768.
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
2
256, 512, 768, 1024, 1280, 1536, 1792 +256 . . .
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