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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.

A200505 Least m>0 such that n = 5^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 4
3 4
4 0
5 0
6 4
7 4
8 5
9 0
10 4
11 4
12 24
13 5
14 4
15 4
16 0
17 15
18 4
19 4
20 75
21 0
22 4
23 4
24 0
25 0
26 4
27 4
28 5
29 39
30 4
31 4
32 15
33 5
34 4
35 4
36 24
37 35
38 4
39 4
40 175
41 31
42 4
43 4
44 0
45 39
46 4
47 4
48 5
49 0
50 4
51 4
52 35
53 5
54 4
55 4
56 21
57 55
58 4
59 4
60 24
61 0
62 4
63 4
64 31
65 39
66 4
67 4
68 5
69 399
70 4
71 4
72 31
73 5
74 4
75 4
76 0
77 15
78 4
79 4

List of values

[0, 0, 4, 4, 0, 0, 4, 4, 5, 0, 4, 4, 24, 5, 4, 4, 0, 15, 4, 4, 75, 0, 4, 4, 0, 0, 4, 4, 5, 39, 4, 4, 15, 5, 4, 4, 24, 35, 4, 4, 175, 31, 4, 4, 0, 39, 4, 4, 5, 0, 4, 4, 35, 5, 4, 4, 21, 55, 4, 4, 24, 0, 4, 4, 31, 39, 4, 4, 5, 399, 4, 4, 31, 5, 4, 4, 0, 15, 4, 4]

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