2. 1) 2, 4,6,8,12
2) 6, 12, 18,30
3) 2, 4
4) 4, 8, 12
3. 1) 19 735
2) 1
3) 19 735
4. 1) 1, 2, 6, 9, 18
2) 1, 2, 4, 8
3) 1, 13
4) 1, 2, 4, 7, 8, 14, 28, 56
5. 1) 1, 2, 3, 5, 6, 10, 15, 30
2) 1, 2, 3, 4, 6, 12
3) 1, 23
4) 1, 2, 3, 4, 6, 8, 9, 12, 24, 36, 72
6. 1) 7, 14, 21, 77, 140
2) 30, 60, 90, 150, 270
3) 100, 500, 1000, 5000, 50000
4) 34, 68, 102, 106, 140
7. 1) 16, 64, 160, 176, 32
2) 12, 36, 48, 120, 144
3) 150, 450, 600, 1500, 1650
4) 47, 94, 470, 517, 564
8. 1) 28, 36, 48, 64, 92, 100, 108
2) 28, 92, 100, 110