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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.

A200507 Least m>0 such that n = 7^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 3
3 0
4 8
5 3
6 0
7 0
8 3
9 7
10 8
11 3
12 8
13 0
14 3
15 16
16 7
17 3
18 8
19 0
20 3
21 16
22 28
23 3
24 0
25 16
26 3
27 16
28 8
29 3
30 7
31 16
32 3
33 0
34 8
35 3
36 8
37 7
38 3
39 28
40 0
41 3
42 8
43 16
44 3
45 0
46 19
47 3
48 0
49 0
50 3
51 7
52 8
53 3
54 0
55 20
56 3
57 16
58 7
59 3
60 8
61 100
62 3
63 16
64 35
65 3
66 8
67 28
68 3
69 16
70 20
71 3
72 7
73 16
74 3
75 16
76 8
77 3
78 28

List of values

[0, 0, 3, 0, 8, 3, 0, 0, 3, 7, 8, 3, 8, 0, 3, 16, 7, 3, 8, 0, 3, 16, 28, 3, 0, 16, 3, 16, 8, 3, 7, 16, 3, 0, 8, 3, 8, 7, 3, 28, 0, 3, 8, 16, 3, 0, 19, 3, 0, 0, 3, 7, 8, 3, 0, 20, 3, 16, 7, 3, 8, 100, 3, 16, 35, 3, 8, 28, 3, 16, 20, 3, 7, 16, 3, 16, 8, 3, 28]

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