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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.

A200524 Least m>0 such that n = 4^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 0
5 3
6 4
7 0
8 3
9 16
10 4
11 3
12 0
13 20
14 3
15 0
16 0
17 3
18 4
19 56
20 3
21 16
22 4
23 3
24 80
25 16
26 3
27 40
28 0
29 3
30 4
31 0
32 3
33 20
34 4
35 3
36 64
37 16
38 3
39 0
40 63
41 3
42 4
43 56
44 3
45 28
46 4
47 3
48 0
49 20
50 3
51 40
52 63
53 3
54 4
55 0
56 3
57 16
58 4
59 3
60 0
61 28
62 3
63 0
64 0
65 3
66 4
67 40
68 3
69 16
70 4
71 3
72 85
73 16
74 3
75 56
76 63
77 3

List of values

[0, 0, 3, 0, 0, 3, 4, 0, 3, 16, 4, 3, 0, 20, 3, 0, 0, 3, 4, 56, 3, 16, 4, 3, 80, 16, 3, 40, 0, 3, 4, 0, 3, 20, 4, 3, 64, 16, 3, 0, 63, 3, 4, 56, 3, 28, 4, 3, 0, 20, 3, 40, 63, 3, 4, 0, 3, 16, 4, 3, 0, 28, 3, 0, 0, 3, 4, 40, 3, 16, 4, 3, 85, 16, 3, 56, 63, 3]

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