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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A227196 a(n) = first i >= 1 for which the Kronecker symbol K(i,n) is not +1 (i.e., is either 0 or -1), 0 if no such i exists.

Table of values

n a(n)
1 0
2 2
3 2
4 2
5 2
6 2
7 3
8 2
9 3
10 2
11 2
12 2
13 2
14 2
15 3
16 2
17 3
18 2
19 2
20 2
21 2
22 2
23 5
24 2
25 5
26 2
27 2
28 2
29 2
30 2
31 3
32 2
33 3
34 2
35 2
36 2
37 2
38 2
39 3
40 2
41 3
42 2
43 2
44 2
45 2
46 2
47 5
48 2
49 7
50 2
51 2
52 2
53 2
54 2
55 3
56 2
57 3
58 2
59 2
60 2
61 2
62 2
63 3
64 2
65 3
66 2
67 2
68 2
69 2
70 2
71 7
72 2
73 5
74 2
75 2
76 2
77 2
78 2
79 3
80 2
81 3
82 2
83 2
84 2
85 2
86 2
87 3

List of values

[0, 2, 2, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 5, 2, 5, 2, 2, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 5, 2, 7, 2, 2, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 7, 2, 5, 2, 2, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 3]

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