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Sum of factors, 7 (10, 12), 11 (28, 40), 5 (6), 13 (22), 19 (34), 2, 3, 4,…
Sum of factors
7
10
21
38
25
30
32
36
12
20
35
11
28
40
5
6
8
15
26
16
39
18
9
14
33
24
27
13
22
19
34
2
3
4
17
23
29
31
37