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A319813 a(n) is the smallest a such that n is divisible by a^n + 1, or 0 if no such a exists.

Table of values

n a(n)
1 1
2 1
3 2
4 0
5 4
6 0
7 6
8 0
9 2
10 3
11 10
12 0
13 12
14 0
15 14
16 0
17 16
18 0
19 18
20 0
21 5
22 0
23 22
24 0
25 4
26 5
27 2
28 0
29 28
30 0
31 30
32 0
33 32
34 13
35 34
36 0
37 36
38 0
39 17
40 0
41 40
42 0
43 42
44 0
45 14
46 0
47 46
48 0
49 6
50 3
51 50
52 0
53 52
54 0
55 19
56 0
57 8
58 17
59 58
60 0
61 60
62 0
63 5
64 0
65 64
66 0
67 66
68 0
69 68
70 0
71 70
72 0
73 72
74 31
75 14
76 0
77 76

List of values

[1, 1, 2, 0, 4, 0, 6, 0, 2, 3, 10, 0, 12, 0, 14, 0, 16, 0, 18, 0, 5, 0, 22, 0, 4, 5, 2, 0, 28, 0, 30, 0, 32, 13, 34, 0, 36, 0, 17, 0, 40, 0, 42, 0, 14, 0, 46, 0, 6, 3, 50, 0, 52, 0, 19, 0, 8, 17, 58, 0, 60, 0, 5, 0, 64, 0, 66, 0, 68, 0, 70, 0, 72, 31, 14, 0, 76]

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