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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.

A349989 a(n) is the smallest k such that k^n + (k+1)^n is divisible by a square > 1.

Table of values

n a(n)
1 4
2 3
3 1
4 113
5 2
6 3
7 3
8 19
9 1
10 1
11 4
12 113
13 4
14 3
15 1
16 765
17 4
18 3
19 4
20 87
21 1
22 3
23 4
24 19
25 2
26 2
27 1
28 28
29 4
30 1
31 4
32 151
33 1
34 3
35 2
36 113
37 4
38 3
39 1
40 19
41 4
42 3
43 4
44 113
45 1
46 3
47 4
48 335
49 3
50 1
51 1
52 113
53 4
54 3
55 1
56 19
57 1
58 3
59 4
60 87
61 4
62 3
63 1
64 379
65 2
66 3
67 4
68 1
69 1
70 1
71 4
72 19
73 4
74 3
75 1
76 113
77 3
78 1
79 4

List of values

[4, 3, 1, 113, 2, 3, 3, 19, 1, 1, 4, 113, 4, 3, 1, 765, 4, 3, 4, 87, 1, 3, 4, 19, 2, 2, 1, 28, 4, 1, 4, 151, 1, 3, 2, 113, 4, 3, 1, 19, 4, 3, 4, 113, 1, 3, 4, 335, 3, 1, 1, 113, 4, 3, 1, 19, 1, 3, 4, 87, 4, 3, 1, 379, 2, 3, 4, 1, 1, 1, 4, 19, 4, 3, 1, 113, 3, 1, 4]

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