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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.

A095167 Triangle read by rows in which the n-th row contains n numbers noncoprime to n and not occurring in earlier rows.

Table of values

n a(n)
1 1
2 2
3 4
4 3
5 6
6 9
7 8
8 10
9 12
10 14
11 5
12 15
13 20
14 25
15 30
16 16
17 18
18 21
19 22
20 24
21 26
22 7
23 28
24 35
25 42
26 49
27 56
28 63
29 32
30 34
31 36
32 38
33 40
34 44
35 46
36 48
37 27
38 33
39 39
40 45
41 51
42 54
43 57
44 60
45 66
46 50
47 52
48 55
49 58
50 62
51 64
52 65
53 68
54 70
55 72
56 11
57 77
58 88
59 99
60 110
61 121
62 132
63 143
64 154
65 165
66 176
67 69
68 74
69 75
70 76

List of values

[1, 2, 4, 3, 6, 9, 8, 10, 12, 14, 5, 15, 20, 25, 30, 16, 18, 21, 22, 24, 26, 7, 28, 35, 42, 49, 56, 63, 32, 34, 36, 38, 40, 44, 46, 48, 27, 33, 39, 45, 51, 54, 57, 60, 66, 50, 52, 55, 58, 62, 64, 65, 68, 70, 72, 11, 77, 88, 99, 110, 121, 132, 143, 154, 165, 176, 69, 74, 75, 76]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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