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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.

A347293 Triangle read by rows: T(n, k) = Sum_{i=1..n} gcd(1 + (i-1) * (k-1),n) for 1 <= k <= n.

Table of values

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

List of values

[1, 2, 3, 3, 5, 5, 4, 8, 4, 8, 5, 9, 9, 9, 9, 6, 15, 10, 9, 10, 15, 7, 13, 13, 13, 13, 13, 13, 8, 20, 8, 20, 8, 20, 8, 20, 9, 21, 21, 9, 21, 21, 9, 21, 21, 10, 27, 18, 27, 18, 15, 18, 27, 18, 27, 11, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 12, 40, 20, 24, 20, 40, 12, 40, 20, 24, 20, 40]

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