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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.

A200523 Least m>0 such that n = 3^x-y^2 (mod m) has no solution, or 0 if no such m exists.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 8
5 0
6 8
7 9
8 0
9 0
10 12
11 0
12 8
13 9
14 8
15 20
16 9
17 0
18 0
19 12
20 8
21 80
22 8
23 0
24 45
25 9
26 0
27 0
28 8
29 80
30 8
31 9
32 0
33 45
34 9
35 20
36 8
37 21
38 8
39 80
40 9
41 80
42 28
43 9
44 8
45 0
46 8
47 0
48 91
49 9
50 20
51 36
52 8
53 0
54 8
55 12
56 0
57 80
58 9
59 80
60 8
61 9
62 8
63 28
64 15
65 0
66 91
67 9
68 8
69 45
70 8
71 0
72 0
73 15
74 0
75 20
76 8
77 0

List of values

[0, 0, 0, 0, 8, 0, 8, 9, 0, 0, 12, 0, 8, 9, 8, 20, 9, 0, 0, 12, 8, 80, 8, 0, 45, 9, 0, 0, 8, 80, 8, 9, 0, 45, 9, 20, 8, 21, 8, 80, 9, 80, 28, 9, 8, 0, 8, 0, 91, 9, 20, 36, 8, 0, 8, 12, 0, 80, 9, 80, 8, 9, 8, 28, 15, 0, 91, 9, 8, 45, 8, 0, 0, 15, 0, 20, 8, 0]

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