Explicație pas cu pas:
1.
D2
19a=190, 192, 194, 196, 198
5aa=500, 522, 544, 566, 588
D5
74a=745, 740
8a0=800, 810, 820, 830, 840, 850, 860, 870, 880, 890
D3
7a5=705, 735, 765, 795
4a8a=4383, 4686
2. D42=1, 2, 3, 6, 7, 14, 21, 42
D70=1, 2, 5, 7, 10, 14, 35, 70