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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.

A252941 Irregular triangle T(n,k) read by rows: T(1,1) = 1, otherwise row n lists the prime factors of A098550(n), with duplicates omitted.

Table of values

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

List of values

[1, 2, 3, 2, 3, 2, 3, 5, 2, 7, 5, 2, 3, 5, 2, 3, 5, 7, 2, 7, 2, 5, 3, 7, 2, 5, 3, 2, 11, 3, 13, 11, 13, 3, 11, 2, 13, 3, 5, 2, 7, 3, 13, 2, 17, 2, 3, 5, 17, 2, 3, 5, 11, 2, 17, 5, 13, 2, 3, 7, 13, 2, 3, 5, 7, 2, 19, 3, 7, 19, 2, 3, 7, 5, 19, 2, 11]

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